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Meaning: The act of making an impromptu speech to a crowd of people. Often politically charged, though it doesn’t have to be.
Origin: This is one of those sayings that stemmed from exactly what it sounds like. In the 1800s, large shipments of soap came in big wooden crates, known as soap boxes. People would often stand on them as a sort of make shift podium when proclaiming things to an outdoor audience.