Definitions
1.verb(of a gun, cannon, Bunsen burner, etc.) To fire in the opposite direction, for example due to an obstruction in the barrel.
2.verb(of an engine) To experience a premature ignition of fuel or an ignition of exhaust gases, making a popping sound.
3.verbTo fail in a manner that brings down further misfortune."His attempt to make money by importing luxury cars backfired horribly when fuel prices tripled."
4.nounA failure that leads to further misfortune.