出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第146页（248字）
比喻对人的爱护、关怀和帮助已经到了极点，例我们待他可谓仁至义尽，他不但不知感谢，竟然还以怨报德。
It can be said that we helped him in every way we could．He has not only not shown any gratitude，but has gone so far as to bite the hand that fed him．