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user-inactivated · 3675 days ago · link · · parent · post: Ask Hubski: What's a phrase that you are interested to know the origins of? OR... what's a word or phrase whose origins you find interesting?
Hoisted by one's own petard I believe that a petard is an explosive grenade of sorts. The idea is that you are hoist (blown into the air) by your own petard (grenade) detonating accidentally. Hurt Locker ... meet Shakespeare.