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Definition of gnaw at phrasal verb from the Oxford Advanced Learner's Dictionary

gnaw at

phrasal verb
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gnaw at somebody
  1. to make somebody 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.
    Topics Feelingsc2
See gnaw at in the Oxford Advanced American Dictionary
efficacy
noun
 
 
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