堕落到这种地步;沉沦到某种程度
to have such low moral standards that you do sth very bad
Stealing from your friends? How could you sink so low?偷到你的朋友头上了?你怎么能堕落到这种地步呢?
释义来自《牛津高阶英汉双解词典》第 9 版