gnaw

啃、咬

The puppy gnawed on an old bone all afternoon.

小狗整个下午都在啃一根旧骨头。

侵蚀、磨损

Waves have gnawed away at the base of the cliff.

海浪不断侵蚀著悬崖的底部。

折磨、啃噬、使苦恼

Guilt gnawed at him for weeks after the accident.

事故过后，罪恶感折磨了他好几个星期。

啃咬、反复咬

She gnawed at her nails while waiting for the results.

等结果的时候她一直啃指甲。