give someone a taste of their own medicine

give someone a taste of their own medicine

or

give someone a dose of their own medicine

If you give someone a taste of their own medicine or a dose of their own medicine, you treat them badly in the same way that they treated you. The famously aggressive interviewer was given a taste of his own medicine today when one caller asked him a series of very direct questions. I haven't called him for over a week. Giving him a dose of his own medicine — see how he likes it.
See also: give, medicine, of, own, taste
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