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cheat on

Idioms  

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Clear-eyed hindsight shows that Sullivan didn’t deliberately cheat on her boyfriend, though.

From Salon • Feb. 20, 2026

“I don’t know what he was using them for, but he has been known for trying to cheat on schoolwork and stuff,” she said.

From Slate • Feb. 12, 2026

Ninety-six people were prosecuted for attempting to cheat on driving tests or impersonate candidates in the 12 months to September last year.

From BBC • Jan. 20, 2026

This past spring, OpenAI offered students two months of free access to ChatGPT, evidently hoping to lure them into buying paid subscriptions that will help them cheat on their homework, papers and tests.

From MarketWatch • Oct. 24, 2025

Even cheating in the classroom is rather highly specific, for a child may cheat on an arithmetic test and not on a spelling test, etc.

From "The Tipping Point" by Malcolm Gladwell

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.