verb

crush (a hard or brittle foodstuff) with the teeth, making a loud but muffled grinding sound.

she paused to crunch a ginger biscuit

munch,chew noisily,chomp,champ,bite,gnaw,masticate,eat,devour,consume,chumble

noun

a loud muffled grinding sound like that of something hard or brittle being crushed.

Marco’s fist struck Brian’s nose with a crunch