Vocabulary

  • over time: Gradually; as time passes.
  • look at: To use your eyes to focus on something
  • in real life: In the physical world; not online or in a fictional setting.
  • going on: To continue doing something
  • go back to: To return to a starting point
  • on average: Typically; usually; based on an average calculation.
  • thanks to: Because of; as a result of.
  • for certain: Definitely; without a doubt.
  • go out: To leave a building (e.g. a house)
  • change over: To switch from one thing to another.
  • add up to: To amount to a particular sum or total.
  • a bit longer: For a slightly longer period of time.
  • ahead of time: Before the scheduled time; early.
  • all along: From the beginning; all the time.
  • hang on: To wait for the person you phoned to answer
  • based on: To use something as the foundation or starting point for something else.
  • in the long run: Eventually; over a long period of time.
  • to let: Indicates that a property is available for rent.
  • stick with: To continue to support or stay loyal to someone or something.
  • on the blob: Resting on an irregular mass or lump of something.
  • instead of: When one thing is replaced by another
  • take over: To gain control of (a company) from someone else
  • at least: As a minimum
  • set up
  • out there: In or to a place that is far away
  • in the end: Finally; after a period of time or series of events.
  • in danger: Exposed to the risk of harm, injury, or loss.
  • just kind of: Used to express a feeling or state in a vague or hesitant way.
  • for the rest: Concerning the remaining people or things.
  • bounce around: To move in an energetic and lively manner; to jump or spring about.
  • down with: Suffering from an illness.
  • breaks down: To forcibly break, destroy or make collapse
  • of course: Sure ; Certainly
  • in theory: According to the stated ideas or principles
  • turned out: To arrive for a public event or entertainment
  • in reality: Actually; in fact; truly.
  • wait for: To wait until someone comes, or something happens
  • has over: To invite someone to your house.
  • process: To organize and use data in a computer
  • scenario: An imagined sequence of events in a plan/project
  • inevitable: That must happen; certain to happen
  • eliminate: To completely remove; to get rid of
  • permanent: Lasting forever; not temporary or changing
  • fragile: Easily affected, broken, or harmed
  • average: Total of numbers divided by the number of items
  • completely: In every way or as much as possible
  • advantage: Thing making the chance of success higher
  • brilliant: Having a great amount of intelligence or talent
  • random: Chosen, done without a particular plan or pattern
  • complex: Group of buildings all used for the same purpose
  • track: To use marks to follow a wild animal
  • version: Different way that someone interprets something
  • environment: Natural world in which plants and animals live
  • chaotic: Utterly confused
  • sacrifice: Person/animal killed in a sacrifice (to a god)
  • bit: Device put in a horse's mouth to control it
  • encourage: To increase the chance of something happening
  • worth: the financial, practical or moral value of somebody/something
  • predator: An animal that hunts and kills other animals
  • predict: To guess or estimate what will or might happen
  • interaction: Process of people or things affecting each other
  • dominant: The strongest; most powerful
  • behavior: The way a person or thing acts; manner
  • grasp: Person's control over something
  • pretty: Being attractive to the eye in a simple way
  • option: A choice
  • equal: Same in shape, size, or number
  • doom: Certain of the failure or destruction of
  • extinction: When every example of animal, plant is dead
  • extinct: (Of animal, etc.) having died out; with none left
  • trend: Current style or fashion
  • frequency: Number of repetitions of (radio or sound) wave
  • notice: To become aware by sight, touch, or hearing
  • science: Study of the physical world, based on facts
  • kind: In a caring and helpful manner
  • learn: To get knowledge or skills by study or experience
  • control: A device designed to operate a machine
  • complexity: State of having many parts and not being simple
  • simple: Not hard to understand or do; not complex
  • chance: The way something happens without planning
  • clarify: To make a liquid become clear or pure
  • density: Degree to which an area is filled or covered
  • change: To exchange one set of clothes for another
  • simulation: A copying method to study the real world
  • start: First time or place that a thing exists; beginning
  • interesting: Taking your attention; making you want to know
  • fluke: Lucky shot or event that is purely accidental
  • skip: Very large waste disposal bin
  • altruistic: Selfless concern for the well-being of others
  • coward: Someone too afraid to do what is right or needed
  • blob: Object that does not have a regular shape
  • altruism: Selfless concern for the well-being of others
  • cowardly: Being fearful and unable to do something right
  • primer: A kind of paint put on to make the top coat better
  • kin: People to whom a person is related
  • dna: Chemical in living cells with genetic information
Placeholder Image

    Preparing usage notes, please check back later

  • not found vocabularyNo vocabulary matches your filters
    • a bit longer

      US

      UK

      • Phrase
      • For a slightly longer period of time.
      • Slightly more extended in length.
      A1
      More
    • add up to

      US /æd ʌp tu/

      UK /æd ʌp tu:/

      • Phrasal Verb
      • To amount to a particular sum or total.
      • To have a particular result or effect; to be equal to.
      A2
      More
    • advantage

      US /ædˈvæntɪdʒ/

      UK /əd'vɑ:ntɪdʒ/

      • Noun (Countable/Uncountable)
      • Thing making the chance of success higher
      • A positive point about something
      • Transitive Verb
      • To make use of something, especially to further one's own position; exploit.
      A2TOEIC
      More
    • ahead of time

      US

      UK

      • Phrase
      • Before the scheduled time; early.
      A1
      More
    • all along

      US /ɔl əˈlɔŋ/

      UK /ɔ:l əˈlɔŋ/

      • Adverb
      • From the beginning; all the time.
      • Phrase
      • In a line parallel to something long.
      A2
      More
    • altruism

      US /ˈæltruˌɪzəm/

      UK /ˈæltruɪzəm/

      • Uncountable Noun
      • Selfless concern for the well-being of others
      C1
      More
    • altruistic

      US

      UK

      • Adjective
      • Selfless concern for the well-being of others
      C1
      More
    • at least

      US /æt list/

      UK /æt li:st/

      • Adverb
      • As a minimum
      • Not less than
      • Phrase
      • No less than; at the minimum
      • Used to indicate that something is positive in a bad situation.
      C2
      More
    • average

      US /ˈævərɪdʒ, ˈævrɪdʒ/

      UK /'ævərɪdʒ/

      • Noun (Countable/Uncountable)
      • Total of numbers divided by the number of items
      • Transitive Verb
      • To add numbers then divide by the number of items
      A2TOEIC
      More
    • based on

      US

      UK

      • Phrasal Verb
      • To use something as the foundation or starting point for something else.
      • Preposition
      • Using something as the main idea or foundation.
      • Relying on something as evidence or justification.
      A1
      More
    • blob

      US /blɑ:b/

      UK /blɒb/

      • Noun
      • Object that does not have a regular shape
      C1
      More
    • bounce around

      US

      UK

      • Phrasal Verb
      • To move in an energetic and lively manner; to jump or spring about.
      • To discuss ideas or options in an informal and exploratory way.
      A2
      More
    • breaks down

      US

      UK

      • Phrasal Verb
      • To forcibly break, destroy or make collapse
      • (Machine) to stop working or become weaker
      A1
      More
    • brilliant

      US /ˈbrɪljənt/

      UK /'brɪlɪənt/

      • Adjective
      • Having a great amount of intelligence or talent
      • Being very bright, like a diamond; shining
      • Noun
      • A diamond or other gem cut in a particular form with many facets to have exceptional brilliance.
      A2
      More
    • change over

      US

      UK

      • Phrasal Verb
      • To switch from one thing to another.
      A2
      More
    • chaotic

      US /keɪˈɒtɪk/

      UK /keɪ'ɒtɪk/

      • Adjective
      • Utterly confused
      B1
      More
    • clarify

      US /ˈklærəˌfaɪ/

      UK /'klærəfaɪ/

      • Transitive Verb
      • To make a liquid become clear or pure
      • To state again so that a point is clearer
      B1
      More
    • complex

      US /kəmˈplɛks, ˈkɑmˌplɛks/

      UK /'kɒmpleks/

      • Countable Noun
      • Group of buildings all used for the same purpose
      • Adjective
      • Not being simple; having many parts or aspects
      A2
      More
    • complexity

      US /kəmˈplɛksɪti/

      UK /kəm'pleksətɪ/

      • Uncountable Noun
      • State of having many parts and not being simple
      • A factor or element that makes something complicated.
      B1
      More
    • coward

      US /ˈkaʊərd/

      UK /ˈkaʊəd/

      • Noun
      • Someone too afraid to do what is right or needed
      B2
      More
    • cowardly

      US /ˈkaʊədli/

      UK /'kaʊədlɪ/

      • Adjective
      • Being fearful and unable to do something right
      B2
      More
    • density

      US /ˈdɛnsɪti/

      UK /ˈdensəti/

      • Noun (Countable/Uncountable)
      • Degree to which an area is filled or covered
      • The degree of compactness of a substance.
      C1TOEIC
      More
    • dna

      US

      UK

      • Noun (Countable/Uncountable)
      • Chemical in living cells with genetic information
      B2
      More
    • dominant

      US /ˈdɑmənənt/

      UK /ˈdɒmɪnənt/

      • Adjective
      • The strongest; most powerful
      • Being the most common, significant or important
      • Noun
      • (Music) The fifth note of a scale.
      B1
      More
    • doom

      US /dum/

      UK /du:m/

      • Noun (Countable/Uncountable)
      • Certain of the failure or destruction of
      • Very bad, unhappy future event or situation
      • Transitive Verb
      • To make failure, defeat or death certain for
      B2
      More
    • down with

      US /daʊn wɪð/

      UK /daun wið/

      • Adjective
      • Suffering from an illness.
      • Agreeable to; in favor of.
      • Interjection
      • An expression of opposition to something.
      A1
      More
    • eliminate

      US /ɪˈlɪməˌnet/

      UK /ɪ'lɪmɪneɪt/

      • Transitive Verb
      • To completely remove; to get rid of
      • To remove from a contest by beating them
      B1TOEIC
      More
    • encourage

      US /ɛnˈkɚrɪdʒ, -ˈkʌr-/

      UK /ɪn'kʌrɪdʒ/

      • Transitive Verb
      • To increase the chance of something happening
      • To make someone more determined or confident
      A2TOEIC
      More
    • extinct

      US /ɪkˈstɪŋkt/

      UK /ɪkˈstɪŋkt/

      • Adjective
      • (Of animal, etc.) having died out; with none left
      • (E.g. of volcano) not active
      B1TOEIC
      More
    • extinction

      US /ɪkˈstɪŋkʃən/

      UK /ɪkˈstɪŋkʃn/

      • Noun (Countable/Uncountable)
      • When every example of animal, plant is dead
      • The process of something ceasing to exist or be active.
      B1
      More
    • fluke

      US /fluk/

      UK /flu:k/

      • Noun
      • Lucky shot or event that is purely accidental
      C1TOEIC
      More
    • for certain

      US /fɔr ˈsɚtn/

      UK /fɔ: ˈsə:tn/

      • Idiom
      • Definitely; without a doubt.
      • Phrase
      • Without any doubt; definitely.
      More
    • for the rest

      US /fɔr ði rɛst/

      UK /fɔ: ðə rest/

      • Phrase
      • Concerning the remaining people or things.
      • During the remaining part of a period of time.
      A1
      More
    • fragile

      US /ˈfrædʒəl, -ˌaɪl/

      UK /'frædʒaɪl/

      • Adjective
      • Easily affected, broken, or harmed
      • Weak or delicate; easily damaged in health
      B2TOEIC
      More
    • frequency

      US /ˈfrikwənsi/

      UK /'fri:kwənsɪ/

      • Uncountable Noun
      • Number of repetitions of (radio or sound) wave
      • How often something happens
      B1TOEIC
      More
    • go back to

      US /ɡo bæk tu/

      UK /ɡəu bæk tu:/

      • Phrasal Verb
      • To return to a starting point
      A1
      More
    • go out

      US /ɡo aʊt/

      UK /ɡəu aut/

      • Phrase
      • To leave a building (e.g. a house)
      • Phrasal Verb
      • (Of a fire) to burn out; be extinguished
      • Go out of fashion to stop being fashionable
      A1
      More
    • going on

      US /ˈɡoɪŋ ɑn/

      UK /ˈgəʊɪŋ ɔn/

      • Phrasal Verb
      • To continue doing something
      • To happen (usually negative)
      A1
      More
    • grasp

      US /ɡræsp/

      UK /ɡrɑ:sp/

      • Noun
      • Person's control over something
      • Act of holding something strongly in your hands
      • Transitive Verb
      • To hold something in your hand very tightly
      • To understand or make sense of a complex idea
      B1TOEIC
      More
    • hang on

      US /hæŋ ɑn/

      UK /hæŋ ɔn/

      • Phrasal Verb
      • To wait for the person you phoned to answer
      • To persevere or persist, especially in a difficult situation.
      A2
      More
    • has over

      US

      UK

      • Phrasal Verb
      • To invite someone to your house.
      • To have more than a certain number or amount.
      A1
      More
    • in danger

      US /ɪn ˈdendʒɚ/

      UK /in ˈdeindʒə/

      • Phrase
      • Exposed to the risk of harm, injury, or loss.
      • At risk of experiencing something negative or harmful.
      A1
      More
    • in real life

      US /ɪn ˈriəl laɪf/

      UK /in riəl laif/

      • Phrase
      • In the physical world; not online or in a fictional setting.
      • Actually; genuinely; not made up or fictional.
      A2
      More
    • in reality

      US /ɪn riˈælɪti/

      UK /in riˈæliti/

      • Phrase
      • Actually; in fact; truly.
      B2
      More
    • in the end

      US /ɪn ði ɛnd/

      UK /in ðə end/

      • Phrase
      • Finally; after a period of time or series of events.
      • Ultimately; as the final result or consequence.
      A1
      More
    • in the long run

      US

      UK

      • Phrase
      • Eventually; over a long period of time.
      A1
      More
    • in theory

      US /ɪn ˈθiəri/

      UK /in ˈθiəri/

      • Adverb
      • According to the stated ideas or principles
      • Phrase
      • According to the theoretical possibilities rather than actual practice.
      B2
      More
    • inevitable

      US /ɪnˈɛvɪtəbəl/

      UK /ɪnˈevɪtəbl/

      • Adjective
      • That must happen; certain to happen
      • Sure to occur or happen
      • Noun (Countable/Uncountable)
      • A situation that is unavoidable
      • Things that cannot be avoided
      A2
      More
    • instead of

      US /ɪnˈstɛd ʌv/

      UK /inˈsted ɔv/

      • Preposition
      • When one thing is replaced by another
      • Adverb
      • As a substitute or alternative.
      A1
      More
    • interaction

      US /ˌɪntɚˈækʃən/

      UK /ˌɪntər'ækʃn/

      • Noun (Countable/Uncountable)
      • Process of people or things affecting each other
      • The activity of talking to other people, working together etc
      A2
      More
    • just kind of

      US

      UK

      • Phrase
      • Used to express a feeling or state in a vague or hesitant way.
      • Used to indicate something is approximately or generally similar to something else.
      A2
      More
    • kin

      US /kɪn/

      UK /kɪn/

      • Noun
      • People to whom a person is related
      B2
      More
    • look at

      US /lʊk æt/

      UK /luk æt/

      • Phrasal Verb
      • To use your eyes to focus on something
      • To focus your eyes on something carefully
      A1
      More
    • of course

      US /ʌv kɔː(r)s/

      UK /ɔv kɔː(r)s/

      • Adverb
      • Sure ; Certainly
      • Phrase
      • For sure; certainly
      A2
      More
    • on average

      US /ɑn ˈævərɪdʒ/

      UK /ɔn ˈævəridʒ/

      • Phrase
      • Typically; usually; based on an average calculation.
      B1
      More
    • on the blob

      US /ɑn ðə blɑb/

      UK /ɒn ðə blɒb/

      • Preposition
      • Resting on an irregular mass or lump of something.
      C2
      More
    • option

      US /ˈɑpʃən/

      UK /'ɒpʃn/

      • Noun (Countable/Uncountable)
      • A choice
      • A right to buy or sell something at a particular price within a particular period.
      A2TOEIC
      More
    • out there

      US /aʊt ðɛr/

      UK /aut ðɛə/

      • Adverb
      • In or to a place that is far away
      • Existing in the universe
      • Adjective
      • Unconventional; strange; avant-garde
      • Existing or available.
      A1
      More
    • over time

      US /ˈovɚ taɪm/

      UK /ˈəuvə taim/

      • Phrase
      • Gradually; as time passes.
      • During a long period.
      • Adverb
      • Gradually; as time passes.
      B1
      More
    • permanent

      US /ˈpɚmənənt/

      UK /'pɜ:mənənt/

      • Adjective
      • Lasting forever; not temporary or changing
      • Intended to last or remain for an unlimited period
      • Noun
      • A person who is a permanent employee.
      • A chemical treatment to create lasting curls or waves in the hair.
      B1TOEIC
      More
    • predator

      US /ˈprɛdətɚ, -ˌtɔr/

      UK /'predətə(r)/

      • Countable Noun
      • An animal that hunts and kills other animals
      • Person preying on the weak to gain advantage
      B1
      More
    • predict

      US /prɪˈdɪkt/

      UK /prɪ'dɪkt/

      • Transitive Verb
      • To guess or estimate what will or might happen
      A2TOEIC
      More
    • primer

      US /ˈprɪmɚ/

      UK /'praɪmə(r)/

      • Noun
      • A kind of paint put on to make the top coat better
      • A book that covers the basics of a subject
      B2
      More
    • process

      US /ˈprɑsˌɛs, ˈproˌsɛs/

      UK /prə'ses/

      • Transitive Verb
      • To organize and use data in a computer
      • To deal with official forms in the way required
      • Noun (Countable/Uncountable)
      • Dealing with official forms in the way required
      • Set of changes that occur slowly and naturally
      A2TOEIC
      More
    • random

      US /ˈrændəm/

      UK /'rændəm/

      • Adjective
      • Chosen, done without a particular plan or pattern
      B1
      More
    • sacrifice

      US /ˈsækrəˌfaɪs/

      UK /'sækrɪfaɪs/

      • Noun
      • Person/animal killed in a sacrifice (to a god)
      • Person/animal killed to please a god
      • Transitive Verb
      • To kill an animal or human to please a god
      • To give up your life for others, for a cause etc.
      B1
      More
    • scenario

      US /səˈner.i.oʊ/

      UK /sɪˈnɑː.ri.əʊ/

      • Noun
      • An imagined sequence of events in a plan/project
      B1
      More
    • science

      US /ˈsaɪəns/

      UK /'saɪəns/

      • Uncountable Noun
      • Study of the physical world, based on facts
      A2TOEIC
      More
    • set up

      US /sɛt ʌp/

      UK /set ʌp/

      • Phrasal Verb
      • To make arrangements for something; establish
      • Verb (Transitive/Intransitive)
      • To arrange or prepare something for use.
      • To start a business, organization, etc.
      A1
      More
    • simulation

      US /ˌsɪmjəˈleʃən/

      UK /ˌsɪmjuˈleɪʃn/

      • Noun
      • A copying method to study the real world
      B1TOEIC
      More
    • skip

      US /skɪp/

      UK /skɪp/

      • Countable Noun
      • Very large waste disposal bin
      • Intransitive Verb
      • To move forward by taking fast steps and jumps
      • To move rapidly, from one topic to another
      B2
      More
    • stick with

      US /stɪk wɪð/

      UK /stik wið/

      • Phrasal Verb
      • To continue to support or stay loyal to someone or something.
      • To continue doing or using something; to persevere.
      A1
      More
    • take over

      US /tek ˈovɚ/

      UK /teik ˈəuvə/

      • Phrasal Verb
      • To gain control of (a company) from someone else
      • To assume control or possession of something.
      A1
      More
    • thanks to

      US /θæŋks tu/

      UK /θæŋks tu:/

      • Preposition
      • Because of; as a result of.
      A1
      More
    • to let

      US /tu lɛt/

      UK /tu let/

      • Preposition
      • Indicates that a property is available for rent.
      A2
      More
    • track

      US /træk/

      UK /træk/

      • Transitive Verb
      • To use marks to follow a wild animal
      • To move a certain way/follow a particular course
      • Noun
      • A circular course for running
      • Course or way someone takes, e.g. in education
      A2TOEIC
      More
    • trend

      US /trɛnd/

      UK /trend/

      • Noun (Countable/Uncountable)
      • Current style or fashion
      • General direction that is taken
      • Intransitive Verb
      • To be current and popular
      • To move up or down
      A2
      More
    • turned out

      US

      UK

      • Phrasal Verb
      • To arrive for a public event or entertainment
      • To happen to be in the end
      • Transitive Verb
      • To extinguish or switch off lights.
      A1
      More
    • version

      US /ˈvɚʒən, -ʃən/

      UK /ˈvə:ʃən/

      • Noun
      • Different way that someone interprets something
      • New or different form of something
      A2TOEIC
      More
    • wait for

      US /wet fɔr/

      UK /weit fɔ:/

      • Phrasal Verb
      • To wait until someone comes, or something happens
      A1
      More
    • worth

      US /wɚθ/

      UK /wɜ:θ/

      • Noun (Countable/Uncountable)
      • the financial, practical or moral value of somebody/something
      • having a particular value, especially in money
      • Adjective
      • Having a specified value.
      A2
      More
    Video not in English?
    Video not in English?

    Get the full experience in the app

    Learn anywhere with detailed sentence and usage analysis

    preview
    01:03

    She took a brave step forward, leaving behind her comfort zone to chase her dreams.

    Vocabulary
    • brave

      adj. Having courage

    • comfort zone

      phr. A familiar situation where one feels safe

    Explanation
    a brave step is a noun phrase, where brave is an adjective modifying the noun step, meaning "a courageous step". forward is an adverb modifying step, meaning "ahead". The whole phrase serves as the object, answering the "what" of took (verb) — she took a brave step forward.

    Get the full experience in the app

    Look up words anytime with pronunciation, part of speech, and usage

    preview

    brave

    US/brev/
    UK/breɪv/
    adj.Brave
    v.t.To bravely face
    A2 Elementary

    Get the full experience in the app

    Practice speaking anytime and get instant pronunciation feedback

    preview

    Try this speaking exercise.

    Try practicing with this sentence.

    80
    B1US
    #altruism#allele#beard#green#blob#extinct

    Simulating Green Beard Altruism

    0
    Yuxixi posted on 2025/11/19
    Ever wondered how cooperation evolves, even among strangers? This video dives into the fascinating 'green beard' effect in evolution simulations, helping you understand population genetics and pick up some advanced vocabulary along the way! It's a fantastic primer for science enthusiasts looking to boost their critical thinking skills.

    Learn this video on the APP!

    The VoiceTube App has more in-depth practice for videos!

    Recommended Videos

    Auto Next Video

    Footer

    Download on the App StoreGet it on Google Play

    About

    • About Us
    • Our Learning Services
    • Join Us
    • FAQ
    • Hot Tags

    Services

    • Pronunciation Challenge
    • Saved
    • Search Vocabulary
    • Blog

    Channels

    Levels

    • A1
    • A2
    • B1
    • B2
    • C1
    • C2

    Privacy˙Terms˙
    ©2026 VoiceTube Corporation. All rights reserved