以其人之道,还治其人之身
yǐ qí rén zhī dào , huán zhì qí rén zhī shēn
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1 to use an opponent's own methods to obtain retribution (idiom, from Song dynasty neo-Confucianist Zhu Xi 朱熹); to get revenge by playing sb back at his own game
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2 to give sb a taste of his own medicine