gnaw

1. V-T/V-I If people or animals gnaw something or gnaw at it, they bite it repeatedly. 反復嚙咬

Woodlice attack living plants and gnaw at the stems. 木虱會侵襲活體植物并不停地嚙咬它們的莖。

2. V-I If a feeling or thought gnaws at you, it causes you to keep worrying. 困擾[書面]

...the nagging disquiet that had gnawed at him for days. …困擾了他數(shù)日、令他不得安寧的憂慮。