to cheat on
[phrase form: cheat]
01
浮気する
to have a secret romantic or sexual relationship with someone other than one's own partner
例
She discovered that her partner had cheated on her with a co-worker.
彼女はパートナーが同僚と浮気していたことを発見した。
The rumors about him cheating on his wife turned out to be true.
彼が妻を浮気していたという噂は本当だった。
