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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.

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They were like high-school students trying to hack into the textbook company to cheat on their final exam.

From The Wall Street Journal Jul. 24, 2026

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

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

So right after the first bite of enchilada you say: Dad, did you cheat on Mom or something?

From "Booked" by Kwame Alexander

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