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

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

以牙還牙；以其治人之道還治其人之身

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

我厭倦了他對我的羞辱，于是我決定以牙還牙。

take one's medicine

submit to something disagreeable such as punishment

接受懲罰（或令人討厭的事物）