


The phrase is believed to have originated in the late 19th century, when it was used to refer to the practice of administering a dose of a medicine to a patient that was similar to the one they had been prescribing to others.
The phrase is typically used when someone has been behaving in a way that is unfair, unkind, or harmful to others, and they then find themselves on the receiving end of similar treatment. It's a way of suggesting that they deserve what they're getting.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.

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