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Entry 1 sense Webster, 1913

downstair

· IPA
01 adj. on or of the lower floors of a building, especially the ground floor; as, the downstairs (or downstair) phone; the house has no downstairs …
  1. 1.
    on or of the lower floors of a building, especially the ground floor; as, the downstairs (or downstair) phone; the house has no downstairs bathroom. Opposite of upstairs.