backfire

American  

[bak-fahy^uhr] / ˈbækˌfaɪər /

verb (used without object)

backfired, backfiring

1. (of an internal-combustion engine) to have a loud, premature explosion in the intake manifold.

2. to bring a result opposite to that which was planned or expected.

   The plot backfired.

   Synonyms:

   bomb, flop, boomerang, miscarry

3. to start a fire deliberately in order to check a forest or prairie fire by creating a barren area in advance of it.

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noun

1. (in an internal-combustion engine) premature ignition of fuel in the intake manifold.

2. an explosion coming out of the breech of a firearm.

3. a fire started intentionally to check the advance of a forest or prairie fire.

backfire British  

/ ˌbækˈfaɪə /

verb

1. (of an internal-combustion engine) to emit a loud noise as a result of an explosion in the inlet manifold or exhaust system

2. (of an endeavour, plan, etc) to have an unwanted effect on its perpetrator

   his plans backfired on him

3. to start a controlled fire in order to halt an advancing forest or prairie fire by creating a barren area

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noun

1. 1. an explosion of unburnt gases in the exhaust system

   2. a premature explosion in a cylinder or inlet manifold

2. a controlled fire started to create a barren area that will halt an advancing forest or prairie fire

Etymology

Origin of backfire

An Americanism dating back to 1775–85; back ² + fire

Example Sentences

The pressure is now on CEO Vinai Venkatesham - previously at Arsenal - sporting director Johan Lange, and the Lewis family, who are over-seeing affairs, as the gamble of Tudor's appointment continues to backfire.

From BBC • Mar. 24, 2026

Limiting APRs would backfire and curb credit lines and credit-card rewards for millions, people in the banking industry cautioned.

From MarketWatch • Mar. 19, 2026

This strategy "will backfire for specific audiences, particularly Westerners and others from democracies who are used to having freedom of expression," said Bohl.

From Barron's • Mar. 15, 2026

In other laboratory experiments, the researchers sought to identify when a reappropriation strategy might backfire.

From The Wall Street Journal • Feb. 27, 2026

He was complacent and insecure, daring in the administrative stratagems he employed to bring himself to the attention of his superiors and craven in his concern that his schemes might all backfire.

From "Catch-22" by Joseph Heller

Related Words

• fail
• flop