gnawed
[nɑ:d]
v.
咬( gnaw的过去式和过去分词 );
（长时间） 折磨某人;
（使）苦恼;
（长时间）危害某事物;
例句:
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His attitude towards her gnawed away at her confidence.
他对她的态度一直在削弱她的自尊心.
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The root of this dead tree has been gnawed away by ants.
这棵死树根被蚂蚁唼了.
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Anxiety gnawed at his heart.
他忧心如焚.
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Obama's questions gnawed at the General.
来自NEWYORKER
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In the loft the rats had gnawed great holes in the floor.
来自J. Buchan
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Philip made a hearty meal and gnawed on the bones like Henry VIII.
来自A. Carter