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]