Dressed up or prepared as if for cocktails, or having the characteristics of a cocktail drink.
From 'cocktail' (a mixed drink) + the past participle suffix '-ed', meaning 'mixed together' or 'dressed formally.' The word gained popularity in the 20th century with formal socializing.
The original term 'cocktail' meant a horse with a docked (cut) tail, then became a drink, then a whole style of dressing up—language is wild!
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