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English definition of “fool around”

fool around

(HAVE A SEXUAL RELATIONSHIP) mainly US (UK also fool about) phrasal verb with fool     /fuːl/ verb
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 .Infidelity in relationships
(Definition of fool around (HAVE A SEXUAL RELATIONSHIP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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