Meaning

verb bite or chew on with the teeth

verb become ground down or deteriorate

originFrom Middle English gnawen, gnaȝen, from Old English gnagan, from Proto-West Germanic *gnagan, from Proto-Germanic *gnaganą (“to gnaw”), probably from Proto-Indo-European *gʰnēgʰ- (“to gnaw, scratch”). Cognate with Dutch knagen, German nagen, Danish gnave (“to gnaw”), Norwegian Bokmål gnage, Norwegian Nynorsk gnaga, Swedish gnaga.

Etymology from Wiktionary, CC BY-SA 3.0