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cheat on sb

informal phrasal verb with cheat
 
 
/tʃiːt/ verb [I or T]

Definition

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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