cheat on

باللغة العربية: خَانَ

1. Used other than figuratively or idiomatically: see cheat, on. · I was disqualified for cheating on my final exam.
2. To be unfaithful to, especially in a romantic relationship. (colloquial, transitive) · Six years of a happy relationship, and then she had the nerve to cheat on me with a barman!