[n] a miscalculation that recoils on its maker
[n] a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine
[v] set a controlled fire to halt an advancing forest to prairie fire
[v] emit a loud noise as a result of undergoing a backfire, as of cars
[v] have an unexpected and undesired effect; "Your comments may backfire and cause you a lot of trouble"