gain on vs gammon

gain on

verb
  • To win ground upon; to move faster than, as in a race or contest. 

  • To encroach on. 

  • To obtain influence with. 

  • To get the better of; to have the advantage of. 

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. 

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