Webster's Revised Unabridged Dictionary · 1913

Crunch

Crunch (krunch) , intransitive verb

[Probably of imitative origin; or compare Dutch schransen to eat heartily, or English 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

Crunch , transitive verb

To crush with the teeth; to chew with a grinding noise; to craunch; as, to crunch a biscuit.