Definition of Back-fire:
- 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.
- 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.
- 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.
- To have or experience a back fire or back fires; - said of an internal- combustion engine.