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

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

From Salon

Others had been cheated on, were nervous about exams, were being bullied by their peers or were grappling with the news they weren’t going to qualify for graduation.

From Los Angeles Times

He allegedly recruited partners to hawk the cheats on online marketplaces and through private Discord servers.

From Los Angeles Times

Iris’ smile is too tense; Isaac’s comes too smoothly, even when sharing a memory of catching his father cheating on his mom.

From Los Angeles Times

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