downstairs
1. [ adverb ] on a floor below
Synonyms: down_the_stairs below on_a_lower_floor
Examples:

"the tenants live downstairs"

Related terms: upstairs
2. [ adjective ] on or of lower floors of a building
Synonyms: downstair
Examples:

"the downstairs (or downstair) phone"

Related terms: upstairs ground-floor
Similar spelling:   downstair
  downstage
  domesticise
  downside
  domestic
  domestic_ass
  downstroke
  downstream