cheat on somebody phrasal verb (see also cheat)
to be unfaithful to your husband, wife, or sexual partner by secretly having sex with someone else:
The magazine claims that almost half of Britain’s women cheat on their partners.

[TahlilGaran] Dictionary of Contemporary English ▲

cheat on
cheat on (someone)
to have a sexual relationship with a person while you are married to someone else or are having a relationship with someone else.
It's hard to believe that he cheated on you.

[TahlilGaran] English Idioms Dictionary ▲

cheat on
to be unfaithful to someone
The man began cheating on his wife which was the cause of their divorce.

[TahlilGaran] English Idioms Dictionary ▲

cheat on someone
cheat on (someone)
to have a sexual relationship with a person while you are married to someone else or are having a relationship with someone else.
It's hard to believe that he cheated on you.

[TahlilGaran] English Idioms Dictionary ▲

cheat on someone
to be unfaithful to someone
The man began cheating on his wife which was the cause of their divorce.

[TahlilGaran] English Idioms Dictionary ▲

cheat on someone
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.

[TahlilGaran] English Idioms Dictionary ▲