noun
a deceitful or underhanded action intended to harm someone
adjective
not clean or pure; morally or ethically wrong
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The politician was accused of using a dirty trick to manipulate the election results.
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I can't believe he pulled that dirty trick on her during the game.
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That was a real low-down dirty trick he played on his friend.
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Using misinformation to deceive others is a dirty trick in the world of politics.