observe

US /əbˈzɜ:rv/

UK /əbˈzɜ:v/

A2TOEIC
v.t./i.Verb (Transitive/Intransitive)To celebrate a particular holiday/religious event
The Japanese observe the Obon festival in August
v.t./i.Verb (Transitive/Intransitive)To obey or follow laws, rules, or customs
You need to observe the rules when you play in the pool
v.t./i.Verb (Transitive/Intransitive)To watch carefully; to make a comment
The doctors need to observe the patient and record the results
v.t./i.Verb (Transitive/Intransitive)To say something, especially as a remark or comment.
She observed that the weather was getting colder.

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