munch
v. B1 Intermediate US //ˈməntʃ// munch
v. to eat something in a loud or steady way. You use this when someone is chewing something crunchy, like an apple or chips.
v. to chew or eat something steadily and often audibly. Typically used with crunchy or crisp foods.
He likes to munch on carrots while he works.
The children sat quietly on the grass to munch their sandwiches during the school trip.
As the film reached its climax, the only sound in the theatre was the rhythmic munch of the audience eating popcorn in unison.
Usage
Often used with the preposition 'on' when describing the activity generally.