noun · verb · 15 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Southern-England:Recorded audio is listed in the source snapshot.
/ˈbækfaɪə(ɹ)/
Southern-England:Recorded audio is listed in the source snapshot.
General-American:Recorded audio is listed in the source snapshot.
/bækˈfaɪə(ɹ)/
CMU ARPABET:B AE1 K F AY2 R
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
A premature explosion in the cylinder of a gas or oil engine during the exhaust or the compression stroke, tending to drive the piston in the wrong direction.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
An explosion in the exhaust passages of an internal combustion engine.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
An explosion in other equipment.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
Alternative form of back fire.
Definition source: English Wiktionary via Wiktextract
Usage: alt-of, alternative
Topics: firefighting, government
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
verb
Meaning 5
Of a gun, cannon, Bunsen burner, etc., to fire in the opposite direction, for example due to an obstruction in the barrel.
Definition source: English Wiktionary via Wiktextract
Usage: intransitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
verb
Meaning 6
Of a reciprocating engine, to experience a premature ignition of fuel or an ignition of exhaust gases, making a popping sound.
Definition source: English Wiktionary via Wiktextract
Usage: intransitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
verb
Meaning 7
To fail in a manner that brings down further misfortune.
Definition source: English Wiktionary via Wiktextract
Usage: idiomatic, transitive
Examples
His attempt to make money by importing luxury cars backfired horribly when fuel prices tripled.
Her plan backfired on her.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
verb
Meaning 8
To set a back fire (small, controlled fire to limit spread of a larger fire).
Definition source: English Wiktionary via Wiktextract
Topics: firefighting, government
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
9
noun
Meaning 9
a miscalculation that recoils on its maker
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.