In a strikingly beautiful, magnificent, or stunning manner; with great visual appeal or splendor.
From the adjective 'gorgeous' (from Old French 'gorge' meaning throat, later applied to elaborate neck drapery and elaborate dress generally) plus the adverbial suffix '-ly'.
The journey of 'gorgeous' from meaning 'relating to throat drapery' to meaning 'stunningly beautiful' shows how fashion and appearance metaphors can completely reshape a word's meaning over centuries of use.
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