cheat做动词有很多意思,其中当它意思是be sexually unfaithful to one's partner in marriage时,同义词是cheat on.
You cheated your wife by telling her you were at work but actually you were dating with a girl.
Your wife soon found this out. She was upset and she decided to cheat on you
Generally one cheats sb out of sth, or into doing sth:
He cheated her out of her inheritance.
He cheated them of their land.
He cheated us into believing him a hero.
To cheat on sb means to be sexually unfaithful to sb:
He cheated on his wife.