hoist with his own petard
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A phrase from Shakespeare's 'Hamlet' (Act 3, Scene 4), meaning to be undone by one's own plans or devices. A petard was a small bomb used to breach fortifications.
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Mentioned once in Don Juan In Hell.
Don Juan In Hell
Season 9 · Episode 1 · S09E01
“Frasier, hoist with his own petard, is speechless.”