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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

People now use AI to cheat on homework, generate low-quality social-media videos or get responses like “that’s exactly right!” to everything they input.

From MarketWatch • Oct. 11, 2025

By being able to cover the top of the strike zone, he hasn’t had to cheat on fastballs or hunt on tougher pitches to hit around his knees.

From Los Angeles Times • Jun. 30, 2025

Is it a crime to use technology to cheat on a Presidential debate?

From Slate • Sep. 11, 2024

“At the beginning of the year, I was helping JT cheat on his homework.”

From "The Lions of Little Rock" by Kristin Levine

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.