Nouns

(n)blowback, backfirethe backward escape of gases and unburned gunpowder after a gun is fired
(n)backfirea loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine
(n)backfirea fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path
(n)backfire, boomeranga miscalculation that recoils on its maker

Verbs

(v)backfire, backlash, recoilcome back to the originator of an action with an undesired effect“Your comments may backfire and cause you a lot of trouble”, “the political movie backlashed on the Democrats”
(v)backfireemit a loud noise as a result of undergoing a backfire“My old car backfires all the time”
(v)backfireset a controlled fire to halt an advancing forest to prairie fire