noun
the practice of winning a game or contest by using methods that are not strictly illegal but are often seen as unsporting or unethical
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The athlete was accused of using gamesmanship to gain an advantage over his opponent.
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She's a master of gamesmanship, always finding ways to outsmart her competitors.
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I can't believe the level of gamesmanship he displayed during the match.
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In the world of politics, gamesmanship is often used to manipulate public opinion.