approve vs sit on

approve

verb
  • To officially sanction; to ratify; to confirm; to set as satisfactory. 

  • To make profit of; to convert to one's own profit — said especially of waste or common land appropriated by the lord of the manor. 

  • To consider worthy (to); to be pleased (with); to accept. 

  • To regard as good; to commend; to be pleased with; to think well of. 

sit on

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

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

  • To block, suppress, restrain. 

  • To be a member of. 

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

  • To restrain (a person). 

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