burke vs sit on

burke

verb
  • To smother; to conceal, hush up, suppress. 

  • To murder by suffocation. 

  • To murder for the same purpose as Burke, to kill in order to have a body to sell to anatomists, surgeons, etc. 

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 burke and sit on occurred in a corpus of books? (source: Google Ngram Viewer )