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cheat on

Idioms

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.

Manchester City footballer Ruben Dias has confirmed his break-up with Love Island presenter Maya Jama, but insisted he did not cheat on her during their relationship.

From BBC • May 30, 2026

Solution manuals have long been online, and any number of web sites have enabled students to cheat on assigned homework.

From The Wall Street Journal • May 25, 2026

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

I showed up every day this semester, sat my butt in every class, did some homework, and didn’t cheat on tests.

From "Speak" by Laurie Halse Anderson

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