Definition of: gnaw

(nô) v.t. gnawed, gnawed or gnawn, gnaw·ing
1. To bite or eat away little by little with or as with the teeth.
2. To make by gnawing: to gnaw a hole.
3. To bite on repeatedly: He gnawed his lip in rage.
4. To torment or oppress with fear, pain, etc.
—v.i.
5. To bite, chew, or corrode persistently or continually.
6. To cause constant worry, pain, etc. [OE gnagan]
—gnaw′er noun