The Oxford Thesaurus An A-Z Dictionary of Synonyms - gnawv.

1) chew, nibble, eat, bite, champ: The marks were made by deer gnawing the bark. 2) erode, eat away, corrode, wear down or away, fret, consume, devour: The acid continues to gnaw away at the metal till it is gone. 3) fret, irritate, harry, hector, pester, worry, bother, plague, trouble, torment, torture, distress, badger, harass, haunt, nag, vex, gall, nettle, irk, peeve, annoy: The feeling that something was very wrong continued to gnaw at her.