approve vs stonewall

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. 

stonewall

verb
  • To obstruct. 

  • To refuse to answer or cooperate, especially in supplying information. 

noun
  • An obstruction. 

  • An alcoholic drink popular in colonial America, consisting of apple cider (or sometimes applejack) mixed with rum (or sometimes gin or whisky). 

  • A refusal to cooperate. 

adj
  • Certain, definite. 

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