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]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "munch":
   bite, bolus, champ, chaw, chew, chew the cud, chew up, chomp,
   chump, crunch, cud, gnash, gnaw, gob, grind, gum, masticate,
   morsel, mouth, mouthful, mumble, nibble, nip, quid, ruminate,
   scrunch, snap, swallow



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.


The Free On-line Dictionary of Computing (30 December 2018):

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)