noun
a person who acts dishonestly or unfairly in order to gain an advantage
verb
to act dishonestly or unfairly in order to gain an advantage
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It is unethical to cheat on a test by looking at someone else's answers.
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I heard he tried to cheat on his girlfriend with her best friend.
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She's always trying to cheat her way out of doing any work.
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Trying to cheat the system will only lead to trouble in the long run.