To restore brightness or color to something that has faded; to make something fade-resistant or to reverse fading.
From de- (reverse, undo) + fade (from Old Norse 'fǫtuð'). A word formation following the pattern of reverse-action verbs like 'defrost' or 'decode.'
Defade is technically a real word that should exist (like how we have 'defrost'), but people rarely use it—we say 'restore color' instead, showing how language sometimes creates words for things we don't actually talk about.
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