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1859, slang shortening of public house (see public (adj.)), which originally meant "any building open to the public" (1570s), then "inn that provides food and is licensed to sell ale, wine, and spirits" (1660s), and finally "tavern" (1768). Pub crawl first attested 1910 in British slang.
A saloon; bar; tavern: a round of Long Island pubs
[1859+ British; fr British public, fr public house]
Publicity: You know Dallas is going to get all that pub (1990s+)