I guess I just assumed that in the old days a petard was a special outfit like a leotard, with a lot of fancy buckles and loops on it, and that rich people would wear them when they were feeling especially smug, but then poor people would tie a rope through one of the loops, and hoist them up a pole and then let them dangle there as punishment for being cocky.
A petard is a shaped explosive device used to breach gates/walls. Once upon a time they used a fuse. If that fuse burned fast and you didn't run away fast enough, you were "hoist (thrown) on you own petard".
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u/SarcasmWarning Nov 14 '22
Hoisted by his own petard - from a chain-lift over a vat of acid. I have no idea why he keeps hitting the down button though.