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253页（224字）
本是道家语，今用以比喻人改过向善，像是换了一个人，例从监狱出来之后，他已脱胎换骨，重新做人。
Since he came out of prison，he has had a complete change of heart and wants to get on his feet and establish himself once more．