The Collaborative International Dictionary of English v.0.48:

Butcher \Butch"er\, v. t. [imp. & p. p. Butchered; p. pr. &
   vb. n. Butchering.]
   1. To kill or slaughter (animals) for food, or for market;
      as, to butcher hogs.
      [1913 Webster]

   2. To murder, or kill, especially in an unusually bloody or
      barbarous manner. --Macaulay.
      [1913 Webster]

            [Ithocles] was murdered, rather butchered. --Ford.
      [1913 Webster]

   3. to bungle badly; to botch; -- used also when an object is
      damaged (literally or figuratively) in an activity; as,
      the new choir butchered the hymn.

   Syn: mangle. [PJC] butcher-bird
        butcher bird

The Collaborative International Dictionary of English v.0.48:

Butcher \Butch"er\ (b[.u]ch"[~e]r), n. [OE. bochere, bochier,
   OF. bochier, F. boucher, orig., slaughterer of buck goats,
   fr. OF. boc, F. bouc, a buck goat; of German or Celtic
   origin. See Buck the animal.]
   1. One who slaughters animals, or dresses their flesh for
      market; one whose occupation it is to kill animals for
      food.
      [1913 Webster]

   2. A slaughterer; one who kills in large numbers, or with
      unusual cruelty; one who causes needless loss of life, as
      in battle. "Butcher of an innocent child." --Shak.
      [1913 Webster]

   Butcher's meat, such flesh of animals slaughtered for food
      as is sold for that purpose by butchers, as beef, mutton,
      lamb, and pork.
      [1913 Webster]

WordNet (r) 3.0 (2006):

butcher
    n 1: a retailer of meat [syn: butcher, meatman]
    2: a brutal indiscriminate murderer
    3: a person who slaughters or dresses meat for market [syn:
       butcher, slaughterer]
    4: someone who makes mistakes because of incompetence [syn:
       bungler, blunderer, fumbler, bumbler, stumbler,
       sad sack, botcher, butcher, fuckup]
    v 1: kill (animals) usually for food consumption; "They
         slaughtered their only goat to survive the winter" [syn:
         butcher, slaughter]