n the backward escape of gases and unburned gunpowder after a gun is fired
n a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine
n a fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path
n a miscalculation that recoils on its maker
v come back to the originator of an action with an undesired effect
v emit a loud noise as a result of undergoing a backfire
v set a controlled fire to halt an advancing forest to prairie fire
