hoist with own petard

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hoist by/with (one's) own petard

Injured, ruined, or defeated by one's own action, device, or plot that was intended to harm another; having fallen victim to one's own trap or schemes. ("Hoist" in this instance is the past participle of the archaic verb "hoise," meaning to be raised or lifted up. A "petard" was a bell-shaped explosive used to breach walls, doors, and so on.) 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. The senator continually called on authorities to investigate her political opponent's alleged tax evasion. Now it seems as though she may end her political career hoist with her own petard, as federal agents indicted her for tax fraud on Monday.
See also: by, hoist, own, petard
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

hoist with one's own petard

Fig. to be harmed or disadvantaged by an action of one's own which was meant to harm someone else. (From a line in Shakespeare's Hamlet.) She intended to murder her brother but was hoist with her own petard when she ate the poisoned food intended for him. The vandals were hoist with their own petard when they tried to make an emergency call from the pay phone they had broken.
See also: hoist, own, petard
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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