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

she paused to crunch a ginger biscuit

(especially of a computer) process (large quantities of information)

the program crunches data from 14,000 sensors to decipher evolving patterns

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

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

a crucial point or situation, typically one at which a decision with important consequences must be made

when it comes to the crunch you chicken out

a physical exercise designed to strengthen the abdominal muscles; a sit-up