The Collaborative International Dictionary of English v.0.48:

Bitch \Bitch\ (b[i^]ch), n. [OE. biche, bicche, AS. bicce; cf.
   Icel. bikkja, G. betze, peize.]
   1. The female of the canine kind, as of the dog, wolf, and
      fox.
      [1913 Webster]

   2. An opprobrious name for a woman, especially a lewd woman.
      --Pope.
      [1913 Webster]

   3. an unpleasant, malicious, or offensive person.
      [PJC]

   4. something difficult or unpleasant. [slang]
      [PJC]

   5. a complaint. [slang]
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Bitch \Bitch\ (b[i^]ch), v. i.
   to complain in a whining or grumbling manner; to gripe.
   [slang]
   [PJC]

WordNet (r) 3.0 (2006):

bitch
    n 1: an unpleasant difficulty; "this problem is a real bitch"
    2: a person (usually but not necessarily a woman) who is
       thoroughly disliked; "she said her son thought Hillary was a
       bitch" [syn: cunt, bitch]
    3: informal terms for objecting; "I have a gripe about the
       service here" [syn: gripe, kick, beef, bitch,
       squawk]
    4: female of any member of the dog family
    v 1: complain; "What was he hollering about?" [syn: gripe,
         bitch, grouse, crab, beef, squawk, bellyache,
         holler]
    2: say mean things [syn: backbite, bitch]