To have or experience a back fire or back fires; -- said of an internal-combustion engine.
- 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.
- To explode in the manner of or make the sound of a backfire.
- To start or use a backfire in extinguishing or controlling a forest fire.
- To produce an unexpected, undesired result.