cheat verb definition in Dishonest topic from the Oxford Advanced Learner's Dictionary

cheat

 verb: Dishonest topic
[intransitive] cheat (at something) to act in a dishonest way in order to gain an advantage, especially in a game, a competition, an exam, etc. He cheats at cards. You're not allowed to look at the answers—that's cheating. Anyone caught cheating will be automatically disqualified from the examination.