broadside vs knocking

broadside

noun
  • A forceful attack, be it written or spoken. 

  • The printed lyrics of a folk song or ballad; a broadsheet. 

  • One side of a ship above the water line; all the guns on one side of a warship; their simultaneous firing. 

  • A large sheet of paper, printed on one side and folded. 

adv
  • Sideways; with the side turned to the direction of some object. 

verb
  • To collide with something side-on. 

knocking

noun
  • An act in which something is knocked on, or the sound thus produced 

  • A repetitive ping, knock, or similar sound coming from an engine in which there are repeated uncontrolled explosions in the combustion chamber. 

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