To disorder or derange; to disturb the arrangement or proper order of something.
From dis- (to reverse) + range (to arrange in order), creating a verb meaning to undo an arrangement or throw something into disorder.
This word is basically a fancy synonym for 'mess up' or 'disarrange'—it's archaic, but it shows how English speakers used dis- as a universal prefix to create opposites of almost any action!
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