To "cheat" means to fail to abide by rules or promises, to intentionally deceive or to avoid responsibilities. It usually refers to a certain competition, game, argument or transaction in which one party does not act in accordance with established rules or agreements, but adopts unfair means to gain an advantage or avoid losses.

For example, deliberately violating the rules in a game, using strong arguments in an argument, and not keeping one's word in a transaction can all be called " cheating ". Such behavior is unethical and may cause dissatisfaction and resentment to others.

The word "goof" is often used to describe someone who tries to win or benefit through unfair or dishonest means. It emphasizes the unfairness of the behavior and the violation of the principle of good faith.