backfire

(noun) the backward escape of gases and unburned gunpowder after a gun is fired. Synonyms: blowback.

(noun) a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine.

(noun) a fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path.

(noun) a miscalculation that recoils on its maker. Synonyms: boomerang.

(verb) come back to the originator of an action with an undesired effect. Synonyms: backlash, recoil. Example: "Your comments may backfire and cause you a lot of trouble."

(verb) emit a loud noise as a result of undergoing a backfire. Example: "My old car backfires all the time."

(verb) set a controlled fire to halt an advancing forest to prairie fire.