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Back fire
(a) A fire started ahead of a forest or prairie fire to burn only against the wind, so that when the two fires meet both must go out for lack of fuel. (b) 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 a direction reverse to that in which it should travel; also, an explosion in the exhaust passages of such ah engine.
Back"-fire°
v. i.
1. (Engin.) To have or experience a back fire or back fires; -- said of an internal-combustion engine.
2. Of a Bunsen or similar air-fed burner, to light so that the flame proceeds from the internal gas jet instead of from the external jet of mixed gas and air.
-- Back"-fir°ing, n.
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