The Collaborative International Dictionary of English v.0.48:

Munch \Munch\, v. t. & i. [imp. & p. p. Munched; p. pr. & vb.
   n. Munching.] [Prob. akin to mumble: cf. also F. manger to
   eat (cf. Mange), and m[^a]cher to cher (cf. Masticate).
   See Mumble.]
   To chew with a grinding, crunching sound, as a beast chews
   provender; to chew deliberately or in large mouthfuls.
   [Formerly written also maunch and mounch.]
   [1913 Webster]

         I could munch your good dry oats.        --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Munch
    n 1: Norwegian painter (1863-1944) [syn: Munch, Edvard
         Munch]
    2: a large bite; "he tried to talk between munches on the
       sandwich"
    v 1: chew noisily; "The children crunched the celery sticks"
         [syn: crunch, munch]

The Free On-line Dictionary of Computing (19 January 2023):

munch

   To transform information in a serial fashion, often requiring
   large amounts of computation.  To trace down a data structure.
   Related to crunch and nearly synonymous with grovel, but
   connotes less pain.

   Often confused with mung.

   [Jargon File]

   (1995-01-10)


The Jargon File (version 4.4.7, 29 Dec 2003):

munch
 vt.

    [often confused with mung, q.v.] To transform information in a serial
    fashion, often requiring large amounts of computation. To trace down a data
    structure. Related to crunch and nearly synonymous with grovel, but
    connotes less pain.