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to gnaw at
01
to cause someone persistent worry or discomfort
gnaw at
v
Example
Regret gnawed at him as he realized what he had lost.
The fear of failure continues to gnaw at him every day.
Worry about his health started to gnaw at his family.
Guilt started to gnaw at her after the argument.
The rust gnawed at the edges of the metal, weakening it.
