I. down ‧ stairs 1 S2 /ˌdaʊnˈsteəz◂ $ -ˈsterz/ BrE AmE adverb
towards or on a lower floor of a building, especially a house OPP upstairs :
Rosie ran downstairs to answer the door.
Charles was downstairs in the kitchen.
—downstairs adjective :
a downstairs bathroom
II. down·stairs 2 BrE AmE noun
the downstairs the rooms on the ground floor in a house:
We have still got to paint the downstairs.