cheat on

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

Example Sentences

“After a while, it’s like a woman who knows her partner is a cheater but keeps saying, ‘He’s not a cheater, he’s not a cheater’ and then gets upset when he cheats on her again.

Read more on Los Angeles Times

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.

Read more on MarketWatch

A major lawsuit against five leading carmakers accused of cheating on emissions tests is set to begin at the High Court on Monday.

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During the lengthy separation brought on by the war, many women at home suspected their husbands of cheating on them.

Read more on The Wall Street Journal

Women should not have to settle for men who cheat on them, or abandon, abuse or exploit them in unequal relationships.

Read more on Salon