Pronunciation: /ˈbakdrɑːft/
(US backdraft)
noun
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1a current of air or water that flows backwards down a chimney, pipe, etc.: when she opened the window she created a backdraught that sucked the fire right through the bedroom
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2a phenomenon in which a fire that has consumed all available oxygen suddenly explodes when more oxygen is made available, typically because a door or window has been opened.