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gnaw  (gnaws 3rd person present) (gnawing present participle) (gnawed past tense & past participle )
1  verb If people or animals gnaw something or gnaw at it, they bite it repeatedly.  (=chew) 
Woodlice attack living plants and gnaw at the stems...  V at/on n 
2  verb If a feeling or thought gnaws at you, it causes you to keep worrying. 
WRITTEN 
(=nag) 

Doubts were already gnawing away at the back of his mind...  V at n