pub (n.)youdaoicibaDictYouDict[pub 词源字典]
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.[pub etymology, pub origin, 英语词源]