give someone a dose (或taste) of their own medicine

give someone the same bad treatment that they have given to others

以牙还牙；以其治人之道还治其人之身

tired of his humiliation of me, I decided to give him a taste of his own medicine.

我厌倦了他对我的羞辱，于是我决定以牙还牙。

take one's medicine

submit to something disagreeable such as punishment

接受惩罚（或令人讨厌的事物）