Webster's English Dictionary

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beef

1. beef \'be-f\ \'be-fs\ \'be-vz\ n or beefs or beeves [ME, fr. OF buef ox, 
   beef, fr. L bov-, bos head of cattle -] pl  more at COW 1: the flesh of an 
   adult domestic bovine  2a: an ox, cow, or bull in a full-grown or nearly 
   full-grown state; esp)X : a steer or cow fattened for food 2b: a dressed 
   carcass of a beef animal  2c: beef animals  3: muscular flesh : BRAWN  pl 
   beefs, slang  4: COMPLAINT 
2. beef vt : to add strength or power to COMPLAIN