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English definition of “mess around with sb”

mess around with sb

mainly US informal phrasal verb with mess     /mes/ verb
If a married man or woman messes around with someone, they have a sexual relationship with someone who is not their wife or husband : She found out that her husband was messing around with his secretary .Infidelity in relationships
(Definition of mess around with sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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