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. (Note: "hoist" in this instance is the simple past-tense 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

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
References in periodicals archive ?
If someone gives you short shrift in a new-fangled way it probably puts you on your mettle because you don't want to eat humble pie or be hoist with your own petard. These are common, easily understood expressions--but what about shrift, newfangled, mettle, humble pie, and petard?
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