[n] a large and strong and heavyset man; "he was a bull of a man"; "a thick-skinned bruiser ready to give as good as he got"
1. One who, or that which, bruises.
2. A boxer; a pugilist. --R. Browning. Like a new bruiser on Broughtonic sand, Amid the lists our hero takes his stand. --T. Warton.
3. A concave tool used in grinding lenses or the speculums of telescopes. --Knight.