To treat one in his own way; to give someone a dose of their own medicine; to hoist with one's own petard.
小明经常在工作中开别人的玩笑，这次同事们决定以其人之道，还治其人之身，给他也开个善意的玩笑。
Xiao Ming often plays jokes on others at work. This time, his colleagues decided to give him a taste of his own medicine by playing a good-natured joke on him.
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