Chewed or bit repeatedly on something, often worn away gradually; can also mean something bothered you persistently.
From Old English 'gnagian,' related to German 'nagen,' with roots in Proto-Germanic expressing the idea of biting or nibbling. The metaphorical sense of 'worry' developed because gnawing is a persistent, ongoing action.
Rodents gnaw not just to eat, but because their teeth never stop growing—they must gnaw constantly to keep them manageable, making the word perfect for describing any persistent, nagging feeling!
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