gnaw/nɔ; nɔː/ v [I,T] to keep biting something 啃，咬: The animal began to gnaw at the ropes holding her. 那动物开始咬那条束缚着它的绳索。
gnaw at sb if a feeling or thought gnaws at you, it makes you feel worried or anxious 〔情感或思想〕困扰，折磨〔某人〕: Guilt had been gnawing at me all day. 罪疚感整天困扰着我。