Meaning of “sleep with sb” in the English Dictionary

british dictionary

"sleep with sb" in British English

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sleep with sb

informal
phrasal verb with sleep uk /sliːp/ us /sliːp/ verb slept, slept

C2 to have sex with someone:

He found out that his wife had been sleeping with his best friend.

(Definition of “sleep with sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)