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Use "downstair" in a sentence
"Hearing the victim's story, Xu ran downstair to find the doctor."
"The downstair is more of a casual, bistro type restaurant."
"There was a few electrical outlets that were not working, so I went downstair to the breaker box, resetted the faulty breaker, and boom, a huge electrical arc came shooting out at me, into my hand and up my arm."