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cheat on (someone or something)
1. To act deceptively or unfairly while completing a task or participating in a competition. I can't believe that Katie cheated on the test—I always thought she was an honest person.
2. To be unfaithful to one's romantic partner. Well, I heard that Jane cheated on Rob, and that's really why they're getting divorced.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Be sexually unfaithful to, as in They broke up right after she found he was cheating on her. [Colloquial; 1920s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.