backfire

Backfire means the premature ignition of fuel in a car.

(verb)

A car making a loud explosive noise is an example of backfire.

Backfire is defined as something happens in the opposite way than you wanted it to happen.

(verb)

An example of backfire is when you buy your wife roses to make her happy and she gets mad because you forgot that she hates roses.

The definition of backfire is a sound made by an engine because the fuel in it is not burning correctly.

(noun)

A loud popping noise coming from the engine of a car is an example of a backfire.

See backfire in Webster's New World College Dictionary

noun

☆ a fire started to stop an advancing prairie fire or forest fire by creating a burned area in its path
a premature ignition of fuel or an explosion of unburned exhaust gases in an internal-combustion engine, sometimes preventing the completion of the compression stroke and reversing the direction of the piston
an explosive force toward the breech, rather than through the muzzle, of a firearm

intransitive verb backfired, backfiring

☆ to use or set a backfire
to explode as a backfire
to have an unexpected and unwelcome result; go awry; boomerang: his plan backfired

See backfire in American Heritage Dictionary 4

noun

An explosion of prematurely ignited fuel or of unburned exhaust gases in an internal-combustion engine.
The backward escape of gases or cartridge fragments when a gun is fired.
A fire started in the path of an oncoming fire in order to deprive it of fuel and thereby control or extinguish it.

intransitive verb back·fired, back·fir·ing, back·fires