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    tough

    US /tʌf/

    UK /tʌf/

    • Adjective
    • (Of food) difficult to chew or bite through
    • Very difficult to do or deal with
    • Noun
    • A rough and aggressive person.
    concrete

    US /kɑnˈkrit, kɑŋ-, ˈkɑnˌkrit, ˈkɑŋ-/

    UK /'kɒŋkri:t/

    • Uncountable Noun
    • Hard building material made of cement, sand, water
    • Transitive Verb
    • To cover or make with a hard grey building material
    • To lay or cover with concrete.
    spark

    US /spɑrk/

    UK /spɑ:k/

    • Countable Noun
    • Small piece of burning material produced by fire
    • Tiny, brief bit of light caused by electric energy
    • Intransitive Verb
    • To make tiny, brief bits of light
    melt

    US /mɛlt/

    UK /melt/

    • Verb (Transitive/Intransitive)
    • To disappear or to go away
    • To make, become soft or liquid due to heat
    • Uncountable Noun
    • A mass of material that has been melted, especially metal.
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