downstairs downstairs /ˈdaʊnˈstɛrz/

adjective

1. On or of lower floors of a building  ( downstair , downstairs )
   on or of lower floors of a building
    The downstairs (or downstair) phone
   the downstairs (or downstair) phone
   

adverb

1. () On a floor below  ( on a lower floor , below , down the stairs , downstairs )
   on a floor below
    The tenants live downstairs
   the tenants live downstairs
   

 downstair downstair /ˈdaʊnsteɪər/

adjective

1. On or of lower floors of a building  ( downstair , downstairs )
   on or of lower floors of a building
    The downstairs (or downstair) phone
   the downstairs (or downstair) phone