Nightcap
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wiktionary
night + cap
etymonline
nightcap (n.)
also night-cap, late 14c., "covering for the head, worn in bed," from night + cap (n.). In the alcoholic sense, it is attested from 1818. American English sense of "final event in a sporting contest" (especially the second game of a baseball double-header) is by 1924.
Sunday's baseball opening brought out New York vs. Cleveland in the first game. with Philadelphia and Cincinnati as the star attraction in the nightcap number. [The Typographical Journal, September 1923]
