Green’s Dictionary of Slang

(prize-fighting) a tooth.

1825

Pierce Egan’s Life in London 9 Jan. 397/2: I, to use the technical phraseology of the ‘Fancy,’ applied my mawley with such effect to his ‘mug,’ that every ‘masticator’ chattered in his ‘chaffing-box,’ like the rattle of dice in an angry gamester’s box, and his ‘physog’ was in a twinkling the perfect resemblance of a ‘bullock’s liver’.