curtains vs pale rider

curtains

noun
  • An end or death. 

  • A ring of clear liquid, forming into drops, near the top of a glass of fortified wine; the result of differential evaporation of alcohol and subsequent changes in surface tension; an example of the Marangoni effect. 

pale rider

noun
  • Death, the Grim Reaper or angel of death; and one of the Four Horsemen of the Apocalypse. 

How often have the words curtains and pale rider occurred in a corpus of books? (source: Google Ngram Viewer )