v. t.
v. i. To grow fat or corpulent; to grow plump, thick, or fleshy; to be pampered. [ 1913 Webster ]
And villains fatten with the brave man's labor. Otway. [ 1913 Webster ]
adj. fed until grown and ready for slaughter or for sale in the market; -- of market animals. [ WordNet 1.5 +PJC ]
n. One who, or that which, fattens; that which gives fatness or fertility. [ 1913 Webster ]