Someone gives you "a taste of your own medicine" when they act towards you the same way you act towards others in order to teach you a lesson about the way you are acting. If a man acts rudely to others, for example, acting rudely back to him would be giving him "a taste of his own medicine." Example: "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!" Most "medicine" does not taste good; "your own medicine" is the way you act towards other people; you get "a taste of your own medicine" when you "taste" what it feels like for others to haveyou act towards them the way you do. Example (this is aggressive): "I saw you pushing my brother yesterday... maybe I should give you a taste of your own medicine!" It is like medicine because you think it is good for the other person to learn that they are treating others unfairly, even if the lesson does not taste good. Example: "He's always interrupting people when they are talking; what he deserves is a taste of his own medicine!" Example: "It looks like she got a taste of her own medicine."