the.com/puss

means An informal word that can mean a cat, a person's face, or (in boxing slang) the chin — context alone tells you which.

from The 'cat' sense traces to Puss, a common pet-name for cats across Germanic and related languages (Dutch poes, Low German puus), likely echoing the sound used to call a cat rather than descending from any single root — nobody owns the origin, cats just answer to it everywhere. The 'face' sense is a separate thread, from Irish/Scots Gaelic 'pus,' meaning mouth or lips, often with a sulky curl to it. The 'weak chin' boxing slang grew naturally out of that 'face' sense, since a punch that lands flush on the 'puss' is one that ends the fight.