To remove from a class or category; to deprive of class status or classification.
From dis- (reversal, removal) + class (from Latin classis, originally a division of citizens). This is a modern back-formation following the productive dis- + noun pattern, though it's not standard dictionary English.
This word feels like it *should* exist—we talk about 'declassify' but rarely 'disclass,' which shows how some combinations feel natural while others just don't catch on, even when the logic is identical.
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