give sb a dose/taste of their own medicine

to treat someone as badly as they have treated you

对(某人)以牙还牙

这个惯用短语与我们常说的“以其人之道还治其人之身”异曲同工，就是使用那个人的办法来对待那个人自己。

Did you see those two people cutting in front of us in line just now? Let's cut in front of them and give them a taste of their own medicine!

你看到刚才在咱俩前面插队的那两个人了么?让我们插到他们前面去，以其人之道还治其人之身。