Definitions from Wiktionary ( )

▸ verb:  (of a gun, cannon, Bunsen burner, etc., intransitive) To fire in the opposite direction, for example due to an obstruction in the barrel.
▸ verb:  (of a reciprocating engine, intransitive) To experience a premature ignition of fuel or an ignition of exhaust gases, making a popping sound.
▸ verb:  (idiomatic, transitive) To fail in a manner that brings down further misfortune.
▸ verb:  (firefighting) To set a back fire (small, controlled fire to limit spread of a larger fire).
▸ noun:  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 the wrong direction.
▸ noun:  An explosion in the exhaust passages of an internal combustion engine.
▸ noun:  An explosion in other equipment.
▸ noun:  (firefighting) Alternative spelling of back fire [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.]

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