A fire that is started in order to burn against and cut off a spreading fire.

See <<arcback>>

Momentary backward burning of flame into the tip of a torch. Also known as flashback.

In an internal combustion engine, an improperly timed explosion of the fuel mixture in a cylinder, especially one occurring during the period that the exhaust or intake valve is open and resulting in a loud detonation.

Rearward escapement of gases or cartridge fragments upon firing a gun.