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Phrase(s): *a taste of own medicine
Fig. a sample of the unpleasantness that one has been giving other people. (*Typically: get ~; have ~; give someone ~.) • Now you see how it feels to have someone call you names! You are getting a taste of your own medicine! • John, who is often rude and abrupt with people, was devastated when the teacher treated him rudely. He doesn’t like having a dose of his own medicine.
McGrawhill's American Idioms And Phrasal Verbs