back fire

See also: backfire

English

Alternative forms

Etymology

From back +‎ fire.

Noun

back fire (plural back fires)

  1. A small, controlled fire set in the path of a larger uncontrolled fire, in order to limit the spread of the large fire by removing its fuel.
  2. An explosion produced either by a running internal combustion engine that occurs in the air intake or exhaust system rather than inside the combustion chamber or unburned fuel or hydrocarbons ignited somewhere in the exhaust system.

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