pay somebody back in his own coin

odplatit každému stejnou mincí   black eye

The wardens paid him back in his own coin and never missed a chance to degrade him. WebC

Pay her back in her own coin - yes, pay her back double for all that she has done! WebC

I was about to pay her back in her own coin and say something really rude, when all at once we heard a terrible crashing right above us... WebC

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