gammon vs tighten

gammon

verb
  • To lash with ropes (on a ship). 

  • To cure bacon by salting. 

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

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. 

tighten

verb
  • To make tighter. 

  • To raise short-term interest rates. 

  • To make money harder to borrow or obtain. 

  • To become tighter. 

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