hoist with your own petard
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.
hoist with (or by) your own petardhave your plans to cause trouble for others backfire on you.
The phrase is from Shakespeare's Hamlet: ‘For 'tis the sport to have the enginer Hoist with his own petard’. In former times, a petard was a small bomb made of a metal or wooden box filled with explosive powder, while hoist here is the past participle of the dialect verb hoise , meaning ‘lift or remove’.