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English definition of “backfire”

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backfire

verb [I] uk   /ˌbækˈfaɪər/ us    /-ˈfaɪr/

backfire verb [I] (BAD RESULT)

(of a plan) to have the opposite result from the one you intended: Her plans to make him jealous backfired on her when he started dating her best friend.

backfire verb [I] (ENGINE)

(of an engine) to make a loud noise as a result of fuel burning too early: I was woken by the sound of a truck backfiring.
(Definition of backfire from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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