Cheat on

verb, slang

Definitions

Verb
  1. 1
    Used other than figuratively or idiomatically: see cheat, on.

    "I was disqualified for cheating on my final exam."

  2. 2
    be sexually unfaithful to one's partner in marriage wordnet
  3. 3
    To be unfaithful to, especially in a romantic relationship. colloquial, idiomatic, transitive

    "Six years of a happy relationship, and then she had the nerve to cheat on me with a barman!"

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