Definition of downstairs adjective from the Oxford Advanced Learner's Dictionary

  

downstairs

 adjective
adjective
BrE BrE//ˌdaʊnˈsteəz//
 
; NAmE NAmE//ˌdaʊnˈsterz//
 
[only before noun]
 
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that is on a floor of a house or building lower than the one you are on, especially the one at ground level a downstairs bathroom opposite upstairs
See the Oxford Advanced American Dictionary entry: downstairs