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.”
Words nearby upper story
How to use upper story in a sentence
She partly opened the wooden shutter again and pointed to an upper story of the opposite building.The Red Year|Louis Tracy
And the roof was not necessary, for the floors of the upper story served instead.The Amazing Interlude|Mary Roberts Rinehart
The greater part of the upper story does not date further back than the fifteenth century.Belgium|George W. T. (George William Thomson) Omond
Mary slept that night in the same chamber as Morgiana, an airy, high-vaulted room, in an upper story of the palace.God Wills It!|William Stearns Davis
There are paved roads, large quadrangular porticos, both on a level with the ground and with an upper story.