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English definition of “fool around”

fool around

(UK also fool about)
verb uk phrasal verb with fool   /fuːl/ us  

(SILLY)

to behave in a silly way, especially in a way that might have dangerous results: Don't fool around with matches.

(FUNNY)

to behave in a humorous way in order to make other people laugh: He's always getting into trouble for fooling around in class.

(NOT USEFUL)

to spend your time doing nothing useful: We spent the afternoon fooling around on the beach.

(HAVE A SEXUAL RELATIONSHIP)

mainly US If a married person fools around, they have a sexual relationship with someone who is not their husband or wife: She'd been fooling around with someone at work.
(Definition of fool around from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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