This meaning is about using teeth to bite something many times. Usually, small pieces are taken away. It is a simple action that animals and sometimes people do.
The dog gnawed the old shoe hard.
She gnawed a carrot for her snack.
This meaning shows damage to something because of biting or chewing for a long time. It can be objects or materials, not food.
The metal pipe was gnawed by the mice.
The old book’s pages were gnawed at the corners.
This is a figurative use. It means a feeling or thought keeps bothering someone inside. It is like a worry slowly eating their peace.
Fear gnawed at his heart all night.
Doubt gnawed her before the exam.
This usage means a feeling like guilt or regret stays with a person and bothers them for a long time. It is stronger than simple worry.
Guilt gnawed him after the mistake.
Regret gnawed at her for years.
