A sudden flash of fire or light that travels backward, opposite to the intended direction; often a danger in welding or firearms.
From 'back' + 'flash,' a compound term that emerged in industrial and military contexts in the 20th century.
Backflash in welding torches can cause serious burns in microseconds—modern torches have check valves specifically designed to prevent this, saving welders from injuries that would have been career-ending a century ago.
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