cheat

To break the rules for your own gain.

Example: Don't play cards with her, she cheats.

To have a relationship with someone not one's spouse or partner or someone who is married to someone else.

Example: He is cheating on his wife with his secretary.

To avoid something that seemed likely.

Example: To cheat death.

Someone who cheats (informal: cheater).

A card game where the goal is to have no cards remaining in a hand, often by telling lies.