CHEAT ON SOMEONE
cheat on someone: translation
cheat on someone
to commit adultery; to be unfaithful to one's spouse or lover. •
“Have you been cheating on me?” cried Mrs. Franklin.
•
He was caught cheating on his wife.
* * *
{v. phr.}, {informal} To be unfaithful (to one's wife or husband, or to one's sweetheart or fiancee). * /It is rumored that Joe cheats on his wife./