be hoist with one's own petard


be 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. ("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 with one's own petard

To be undone by one's own schemes.See also: hoist, own, petard