Definition of gnaw at phrasal verb from the Oxford Advanced American Dictionary

 

gnaw at

 phrasal verb
phrasal verb
 
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Phrasal Verbs

gnaw at somebody

 
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to make someone feel anxious, frightened, or uncomfortable over a long period of time The problem had been gnawing at him for months. Fear gnawed at her soul.
See the Oxford Advanced Learner's Dictionary entry: gnaw at