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hoist by one's own petard adjective

  /hˈɔ͡ɪst bˈa͡ɪ wˈɒnz ˈə͡ʊn pɛˈtɑːd/ , /hˈɔ͡ɪst bˈa͡ɪ wˈʌnz ˈo͡ʊn pɛˈɾɑː͡ɹd/
  • (idiomatic) Hurt or destroyed by one's own plot or device intended for another; "blown up by one's own bomb".
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