To bite, as something hard or tough, which is not readily separated or crushed; to bite off little by little, with effort; to wear or eat away by scraping or continuous biting with the teeth; to nibble at.
To bite in agony or rage.
To use the teeth in biting; to bite with repeated effort, as in eating or removing with the teeth something hard, unwieldy, or unmanageable.
bite or chew on with the teeth; "gnaw an old cracker"; "chewed on a cookie"
to chew on