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English definition of “be hoist(ed) with/by your own petard”

be hoist(ed) with/by your own petard

formal
to suffer harm from a plan by which you had intended to harm someone elseDamaging and spoilingDestroying and demolishing
(Definition of be hoist(ed) with/by your own petard from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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