a weak-kneed person的解释
1. Xiao S, was a weak-kneed and diffident person. He didn`t like smoking and drinking apart from serving others. Even though his wife was running wild outside, Xiao S used to help his parents-in-law with some heavy housework.
小 S ，人很老实，很内向，既不抽烟也不喝酒，就是愿意为他人服务——尽管妻子在外面胡闹，小 S 还是经常到岳父家干家务活。
2. A weak-kneed person; a spineless person
比喻意志薄弱、没有骨气的人，甚至丧失气节的人