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English definition of “cheat on sb”

cheat on sb

informal phrasal verb with cheat     /tʃiːt/ verb [I or T]
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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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