Source : Webster's Revised Unabridged Dictionary (1913)

Crunch \Crunch\ (kr[u^]nch), v. i. [imp. & p. p. {Crunched}
   (kr[u^]ncht); p. pr. & vb. n. {Crunching}.] [Prob. of
   imitative origin; or cf. D. schransen to eat heartily, or E.
   scrunch.]
   1. To chew with force and noise; to craunch.

            And their white tusks crunched o'er the whiter
            skull.                                --Byron.

   2. To grind or press with violence and noise.

            The ship crunched through the ice.    --Kane.

   3. To emit a grinding or craunching noise.

            The crunching and ratting of the loose stones. --H.
                                                  James.