To strip of foils or protective coverings; to remove the foil wrapper from something.
From de- (remove) + foil (thin metal sheet or protective layer). 'Foil' derives from Old French 'fueil' (leaf), reflecting how thin foil is. The verb emerged as packaging technology developed.
In cooking, when you 'defoil' a dish before serving, you're technically unwrapping metallurgical sheets—aluminum foil is only 0.016 inches thick but strong enough to protect food at 400+ degrees.
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