The Collaborative International Dictionary of English v.0.48:

Pouch \Pouch\, n. [F. poche a pocket, pouch, bag; probably of
   Teutonic origin. See Poke a bag, and cf. Poach to cook
   eggs, to plunder.]
   1. A small bag; usually, a leathern bag; as, a pouch for
      money; a shot pouch; a mail pouch, etc.
      [1913 Webster]

   2. That which is shaped like, or used as, a pouch; as:
      (a) A protuberant belly; a paunch; -- so called in
          ridicule.
      (b) (Zool.) A sac or bag for carrying food or young; as,
          the cheek pouches of certain rodents, and the pouch of
          marsupials.
      (c) (Med.) A cyst or sac containing fluid. --S. Sharp.
      (d) (Bot.) A silicle, or short pod, as of the shepherd's
          purse.
      (e) A bulkhead in the hold of a vessel, to prevent grain,
          etc., from shifting.
          [1913 Webster]

   Pouch mouth, a mouth with blubbered or swollen lips.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pouch \Pouch\, v. t. [imp. & p. p. Pouched; p. pr. & vb. n.
   Pouching.]
   1. To put or take into a pouch.
      [1913 Webster]

   2. To swallow; -- said of fowls. --Derham.
      [1913 Webster]

   3. To pout. [Obs.] --Ainsworth.
      [1913 Webster]

   4. To pocket; to put up with. [R.] --Sir W. Scott.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pouch
    n 1: a small or medium size container for holding or carrying
         things
    2: an enclosed space; "the trapped miners found a pocket of air"
       [syn: pouch, sac, sack, pocket]
    3: (anatomy) saclike structure in any of various animals (as a
       marsupial or gopher or pelican) [syn: pouch, pocket]
    v 1: put into a small bag
    2: send by special mail that goes through diplomatic channels
    3: swell or protrude outwards; "His stomach bulged after the
       huge meal" [syn: bulge, pouch, protrude]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "pouch":
   bag, balloon, beetle, belly, belly out, bilge, billow, bouge, bug,
   bulge, dilate, distend, goggle, jut, overhang, pocket, poke, pooch,
   pop, pout, project, protrude, purse, reticule, round out, sack,
   stand out, stick out, swell, swell out