Downstairs
Pronunciation : Down"stairs
Part of Speech : adv.
Definition : Defn: Down the stairs; to a lower floor. -- a.
Defn: Below stairs; as, a downstairs room.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder