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Why is "so what" an idiom?
Welcome to the forum, acornman. :hi.
Please try to give your threads titles that give us some idea of what they are about. 'So what' idiom; why?' would have been good for this.
Context is important. Please provide enough for us to be able to deal effectively with your question.
Your thread title should include all or part of the word/phrase being discussed.
If you just want to know the meaning of a word, try OneLook Dictionary Search first.