Found 2 items, similar to downstair.
English → English (WordNet) Definition: downstair downstair adj : on or of lower floors of a building; “the downstairs (or downstair) phone” [syn: downstairs] [ant: upstairs]
English → English (gcide) Definition: downstair 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. [WordNet 1.5]