From The Collaborative International Dictionary of English v.0.48:

Gnaw \Gnaw\ (n[add]), v. t. [imp. & p. p. Gnawed (n[add]d); p.
   pr. & vb. n. Gnawing.] [OE. gnawen, AS. gnagan; akin to D.
   knagen, OHG. gnagan, nagan, G. nagen, Icel. & Sw. gnaga, Dan.
   gnave, nage. Cf. Nag to tease.]
   1. 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.
      [1913 Webster]

            His bones clean picked; his very bones they gnaw.
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   2. To bite in agony or rage.
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            They gnawed their tongues for pain.   --Rev. xvi.
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   3. To corrode; to fret away; to waste.
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   4. To trouble in a constant manner; to plague; to worry; to
      vex; -- usually used with at; as, his mounting debts
      gnawed at him.
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