cinch vs nullify

cinch

verb
  • In the game of cinch, to protect (a trick) by playing a higher trump than the five. 

  • To tighten down. 

  • To bring to certain conclusion. 

noun
  • Something that is very easy to do. 

  • A firm hold. 

  • A variety of auction pitch in which a draw to improve the hand is added, and the five of trumps (called "right Pedro") and the five of the same colour (called "left Pedro", and ranking between the five and the four of trumps) are each worth five. Fifty-one points make a game. 

  • A simple saddle girth used in Mexico. 

  • Something that is obvious or certain to occur; a sure thing. 

nullify

verb
  • To prevent from happening. 

  • To make of no use or value; to cancel out. 

  • To make legally invalid. 

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