作弊 in English:

He was cheating.

If you do that, you will be cheating.

Cheating on one's spouse is not usually considered acceptable behavior.

You shouldn't let him get away with cheating.

Tom won't ever be able to forgive Mary for cheating on him.

The people who come on the Maury Povich show often make pretentious claims about their lovers cheating on them.

It appears that my husband is cheating on me with my friend. I want to tell her: "You thieving cat!".

I hit on the terrific idea of cheating at cards by chance.

The student's cheating was easily caught out.

Doing something dishonest is called cheating

That's cheating to start running before everyone else.

If you think you can get away with cheating on the exam, you've got another thing coming.

Dima, Al-Sayib said sternly. "You know you're like a brother from another mother to me, but... cheating an Arab is unforgivable. Goodbye!"

I ask you, he's been cheating me!

Are you ever going to fess up about cheating on your boyfriend?