down the stairs vs downstairs

down the stairs

downstairs

noun

  • The lower floor of a house, at ground level; especially the servants’ quarters. 

  • The genitalia. 

adj

  • Located on a lower floor. 

adv

  • Down the stairs. 

  • In or to hell. 

  • Regarding the genitalia. 

How often have the words down the stairs and downstairs occurred in a corpus of books? (source: Google Ngram Viewer )