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backfire

/ˌbækˈfaɪər/
/ˈbækfaɪə/
IPA guide

Other forms: backfired; backfires; backfiring

Use the word backfire when you talk about the sound a car makes when a small explosion in its exhaust system pops — sometimes as loudly as a gunshot.

Hearing a car's backfire can make you jump, because it makes a sharp, shot-like sound. A backfire is usually caused by unburned fuel, and it can be accompanied by a burst of flame and a brief loss of power in the vehicle, as well as a fairly loud noise. The word comes from an American English term that originally referred to a fire deliberately set to slow the progress of a prairie or forest fire.

Definitions of backfire
  1. noun
    a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine
    see moresee less
    type of:
    blowup, detonation, explosion
    a violent release of energy caused by a chemical or nuclear reaction
  2. noun
    the backward escape of gases and unburned gunpowder after a gun is fired
    synonyms: blowback
    see moresee less
    types:
    back-blast, backblast
    backfire from a recoilless weapon
    type of:
    blowup, detonation, explosion
    a violent release of energy caused by a chemical or nuclear reaction
  3. verb
    emit a loud noise as a result of undergoing a backfire
    “My old car backfires all the time”
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    type of:
    make noise, noise, resound
    emit a noise
  4. verb
    come back to the originator of an action with an undesired effect
    “Your comments may backfire and cause you a lot of trouble”
    synonyms: backlash, recoil
  5. noun
    a miscalculation that recoils on its maker
    synonyms: boomerang
    see moresee less
    type of:
    miscalculation, misestimation, misreckoning
    a mistake in calculating
  6. noun
    a fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path
    see moresee less
    type of:
    fire
    the event of something burning (often destructive)
  7. verb
    set a controlled fire to halt an advancing forest or prairie fire
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    type of:
    burn, burn down, fire
    destroy by fire
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DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘backfire'. Views expressed in the examples do not represent the opinion of Vocabulary.com or its editors. Send us feedback
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