Etymology
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downstairs (adv.)

"down the stairs, below, to or on a lower floor," 1590s, from the prepositional phrase; see down (adv.) + stair. As an adjective, "pertaining to, relating to, or situated on the lower floor of a house," by 1819. As a noun, "the downstairs part of a building," by 1843.

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Definitions of downstairs
1
downstairs (adv.)
on a floor below;
the tenants live downstairs
Synonyms: down the stairs / on a lower floor / below
2
downstairs (adj.)
on or of lower floors of a building;
the downstairs (or downstair) phone
Synonyms: downstair
From wordnet.princeton.edu