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backfire

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verb [intransitive] British English pronunciation: backfire /ˌbækˈfaɪə(r)/ 
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present tense
I/you/we/theybackfire
he/she/itbackfires
present participlebackfiring
past tensebackfired
past participlebackfired
  1. 1
    if a plan or idea backfires, it has the opposite effect to the one that you wanted

    His plan backfired when Sue discovered the hidden presents.

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