A glass of grog before going to bed. Supposed to promote sleep.
“The nightcap is generally a little whisky left in the decanter. To do it honour it is taken neat. Then all get up and wish ‘good-night.ʹ”—Max OʹRell: Friend MacDonald, iii.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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