gammon vs knock

gammon

verb
  • To beat by a gammon (without the opponent bearing off a stone). 

  • To lash with ropes (on a ship). 

  • To cure bacon by salting. 

noun
  • Backgammon (the game itself). 

  • A rope fastening a bowsprit to the stem of a ship (usually called a gammoning). 

  • A victory in backgammon achieved when the opponent has not borne off a single stone. 

  • A cut of quick-cured pork leg. 

  • A middle-aged or older right-wing, reactionary white man, or such men collectively. 

knock

verb
  • To kick a ball towards another player; to pass. 

  • To criticize verbally; to denigrate; to undervalue. 

  • To rap one's knuckles against something, especially wood. 

noun
  • An abrupt rapping sound, as from an impact of a hard object against wood. 

  • A sharp impact. 

  • A batsman's innings. 

  • A blow or setback. 

  • Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it. 

  • Synonym of hunger knock 

  • A criticism. 

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