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downstairs

[adv., n. doun-stairz; adj. doun-stairz] /adv., n. ˈdaʊnˈstɛərz; adj. ˈdaʊnˌstɛərz/
adverb
1.
down the stairs.
2.
to or on a lower floor.
adjective
3.
Also, downstair. pertaining to or situated on a lower floor, especially the ground floor.
noun
4.
(used with a singular verb) the lower floor or floors of a building:
The downstairs is being painted.
5.
the stairway designated for use by people descending:
Don't try to go up the downstairs.
Origin
1590-1600
1590-1600; down1 + stair + -s3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for down stair

downstairs

/ˈdaʊnˈstɛəz/
adverb
1.
down the stairs; to or on a lower floor
noun
2.
  1. a lower or ground floor
  2. (as modifier): a downstairs room
3.
(Brit, informal, old-fashioned) the servants of a household collectively Compare upstairs (sense 6)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for down stair

downstairs

adv., adj.

1590s, from down (adv.) + stairs (see stair).

Online Etymology Dictionary, © 2010 Douglas Harper
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