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1560s, general term of endearment (also puggy), probably related to puck (n.2); one of the earliest senses is "sprite, imp" (1610s). The sense of "miniature dog" is from 1749 (pug-dog); that of "monkey" is 1660s. The word at various times meant "a bargeman" (1590s), "a harlot" (c.1600), and "an upper servant in a great house" (1847).
A prizefighter or boxer; pugilist
[1858+; fr pugilist]