Before revision: A backdraft (North American English) or backdraught (British English) is the abrupt burning of superheated gasses in a fire, caused when oxygen rapidly enters an hot, oxygen-depleted environment; for example, when a window or door to an enclosed space is opened or broken.
After revision: A backdraft (North America English) or backdraught (British English) is the abrupt burning of superheated gasses in a fire, caused when oxygen rapidly enters an hot, oxygen-depleted environment; for example, when a window or door to an enclosed space is opened or broken.