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To be foiled by your own advantage(i.e., [explosives] prematurely explode). The history of the phrase comes from the uses of a petard in a seige (a petard is a volitile early explosive capable of bringing down castle walls). To be hoisted is to be lifted or sent up, which is generally what would happen to you if you were near a petard when it goes off (and that's if you got off lucky). The term, "Hoisted on my own petard" is incorrect (unless [of course] you were pulled up while on a petard, but that'd be clinicly stupid) in that the meaning is altered. This [bastardization] is built upon the assumtion that a petard is a spear.
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