To remove a gown from someone; to undress or divest of formal or ceremonial garments.
From dis- (to remove) + gown (a long dress, from Old Norse/Old English). The formation is straightforward: removing gowns like 'disrobing.'
Medieval and ceremonial contexts used 'disgown' to describe removing official robes—imagine a disgraced knight having his armor or formal dress stripped away as punishment, which is exactly the kind of powerful removal this word conveys.
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