pay sb. back in his own coin

• v. 以其人之道还治其身

pay sb. back in his own coin的用法和样例：

例句

用作动词 (v.)

1. We stand ready at all times to pay any enemy back in his own coin.
   我们随时准备给敌人以反击，以其人之道还治其人之身。
2. She insulted him and he responded in kind.
   她侮辱了他，他也以其人之道还治其人之身。