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The Collaborative International Dictionary of English v.0.48 (gcide)

backfire \backfire\, back fire \back fire\
1. 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.
[Webster 1913 Suppl.]

2.
(a) 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 called a {knock}
or {ping}.
(b) an explosion in the exhaust passages of an internal
combustion engine.
[Webster 1913 Suppl. PJC] Backfire


Backfire \Back"fire`\ Back-fire \Back"-fire`\, v. i.
1. (Engin.) To have or experience a back fire or back fires;
-- said of an internal-combustion engine.
[Webster 1913 Suppl.]

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.
[Webster 1913 Suppl.]