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cheat on

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cheat on someone

to commit adultery; to be unfaithful to one's spouse or lover. "Have you been cheating on me?" cried Mrs. Franklin. He was caught cheating on his wife.

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cheat on somebody

to have a sexual relationship with a person while you are married to someone else or are having a relationship with someone else It's hard to believe that he cheated on you.

See also: cheat, on

cheat on

Be sexually unfaithful to, as in They broke up right after she found he was cheating on her. [Colloquial; 1920s]

See also: cheat, on

cheat on

v.

1. To behave fraudulently during some process or activity: The teacher caught the student cheating on the test.

2. To be unfaithful to someone, especially a spouse or lover: I hired a private detective to see if my spouse was cheating on me.

See also: cheat, on