To diminish or remove the glory, honor, or prestige from something or someone.
From dis- (to reverse) + glorify (to praise highly). Glorify comes from Latin gloria meaning glory. This is a rare constructed word showing how English allows productive word formation with Latin-based prefixes.
English is wild because you can technically 'disglorify' almost anything, even if nobody uses the word—it's built from recognizable parts, so native speakers understand it immediately without ever hearing it before.
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