hoist by (one's) own petard

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hoist by (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: hoist, petard
References in periodicals archive ?
I know as a captain that although you make these decisions in good faith and for what you perceive as the right reasons, you are hoisted by your own petard if things gone wrong.