be hoist/hoisted by/with your own petard

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hoist by/with (one's) own petard

To be injured, ruined, or defeated by one's own action, device, or plot that was intended to harm another; to have fallen victim to one's own trap or schemes. ("Hoist" in this instance is the past participle of the archaic form of the verb "hoise.") I tried to get my boss fired by planting drugs on him, but I was hoist by my own petard when the police caught me with them beforehand.
See also: by, hoist, own, petard
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be hoist/hoisted by/with your own peˈtard

(British English) be caught in the trap that you were preparing for another personThis is from Shakespeare’s play Hamlet. A petard was a small bomb.
See also: by, hoist, own, petard
Farlex Partner Idioms Dictionary © Farlex 2017
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