即以其人之道,还治其人之身

词典解释

[do unto them as they do unto us;answer a fool according to his folly;deal with sb. as he deals with you;does sb. with his own physique;give sb. a dose of his own medicine;pay sb. back in his own coin;requite like for like;pay back in kind] 就拿这个人整治他人的方式,反过来整治这个人本身