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English definition of “cheat on sb”

cheat on sb

informal
verb [I or T] uk phrasal verb with cheat   /tʃiːt/ us  
B2 If you cheat on your husband, wife, or usual sexual partner, you secretly have a sexual relationship with someone else: She found out that he'd been cheating on her.Infidelity in relationships
(Definition of cheat on sb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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