auspice vs death knell

auspice

noun
  • An omen or a sign. 

  • Patronage or protection. 

verb
  • To be patron of; to sponsor. 

death knell

noun
  • A sign or omen foretelling the death or destruction of something. 

  • The tolling of a bell announcing death. 

How often have the words auspice and death knell occurred in a corpus of books? (source: Google Ngram Viewer )