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Noun - The brain; one's ability to think, understand, and rationalize. Origin: The head or brain, as in He's not all there in the upper story. This expression transfers the literal sense of a higher floor in a multistory building to the top portion of the human body. Richard Bentley used it in A Dissertation on the Epistles of Phalaris (1699), where he compares a man with "brains ... in his head" to a man who has "furniture in his upper story."
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