The Collaborative International Dictionary
downstair \downstair\, downstairs \downstairs\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 bathroom. Opposite of upstairs.
Wiktionary
a. (context dated English) downstairs
WordNet
adj. on or of lower floors of a building; "the downstairs (or downstair) phone" [syn: downstairs] [ant: upstairs]
Usage examples of "downstair".
Withou t waitin g for an an• swer, she ra n downstair s an d returne d wit h a box of nails, a framed paintin g for my wall, a thro w pillow for my bed, an d a smashe d pin k box tha t looke d like an old Valentine's Day present.
Rannas and I spent an hour or two rearranging things, the two downstair rooms being made up as office and reception, and the first floor as my own quarters.
Shortly before eight Helene closed the shutters both of the upstair and the downstair windows and of the glass doors into the garden, and returned to the kitchen, which was at the back of the house—that is, on the side facing the road.