quell vs sit on

quell

verb
  • To suppress, to put an end to (something); to extinguish. 

  • To die. 

  • To subdue, put down, or silence (someone or something); to force (someone) to submit. 

noun
  • A subduing. 

  • An emotion or sensation which rises suddenly. 

  • A source, especially a spring. 

sit on

verb
  • To block, suppress, restrain. 

  • To take no action on; to hold in reserve without actually using. 

  • To hold an official inquiry regarding; to deliberate about. 

  • To be a member of. 

  • Used other than figuratively or idiomatically: see sit, on. 

  • To restrain (a person). 

How often have the words quell and sit on occurred in a corpus of books? (source: Google Ngram Viewer )