dose of one's own medicine
Also, taste of one's own medicine. Repayment or retaliation, as in It's time we gave them a dose of their own medicine and simply forget to call them back, or Joe was upset at being left out, but they were just giving him a taste of his own medicine. [Late 1800s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.