knockback vs stonewall

knockback

noun
  • A rejection; a refusal. 

  • A blow that causes the recipient to fall or move backwards, a knock back; a recoil. 

  • Something that impedes or reverses progress; a setback. 

stonewall

noun
  • A refusal to cooperate. 

  • An obstruction. 

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

verb
  • To obstruct. 

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

adj
  • Certain, definite. 

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