Brewer's: Nap

To go nap. To stake all the winnings on the cards in hand; hence, to risk all on one venture. Nap is a game of cards; so called from Napoleon III.

Nap

(A), a doze or short sleep, as “To take a nap,” is the Anglo-Saxon hnæppian or hnapp-ian (to take a nap; the nap of cloth is the Anglo-Saxon hnoppa.)

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