biting (on), champing, chawing, chewing, chomping (on), crunching (on), gnawing (on), masticating, nibbling

ruminatingmunching, noshing, snackingconsuming, eating, ingesting, swallowingbolting, devouring, gobbling (up or down), gorging, gulping, scarfing, scoffing, snacking, wolfingnipping, pecking (at), picking (at)gumming, mumbling