to chew or bite (something) with a noisy crushing sound

crunch popcorn

to cause (something) to make a crushing sound

crunching the gravel underfoot

to move make (one's way) with a crushing sound

crunch one's way through the snow

to crunch something

to make a crushing sound

The car crunched across the gravel

an act or sound of crunching

(the crunch) informal the critical or decisive situation or moment

When it came to the crunch he sided against me