'downstair' definitions:
Definition of 'downstair'
From: WordNet
adjective
On or of lower floors of a building; "the downstairs (or downstair) phone" [syn: downstairs, downstair] [ant: upstair, upstairs]
Definition of 'downstair'
From: GCIDE
- 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]