Gnaw

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Gnaw

(v. t.) 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.
(v. t.) To bite in agony or rage.
(v. t.) To corrode; to fret away; to waste.
(v. i.) To use the teeth in biting; to bite with repeated effort, as in eating or removing with the teethsomething hard, unwiedly, or unmanageable.