Mexican standoff vs deadlock

Mexican standoff

noun
  • A near-collision between two trains; an averted cornfield meet. 

  • A pot that is split among the players because of a tie. 

  • An inconclusive standoff, ending in mutual retreat. 

  • A confrontation among two or more armed parties, none of which wants to attack first (fearing that the other could retaliate), but neither of which will disarm (for fear the other will attack). 

  • A stalemate, or a confrontation among two or more sides that no side can win. 

  • A three-way or more standoff. 

deadlock

noun
  • A standstill resulting from the opposition of two evenly matched forces; a stalemate or impasse. 

  • An inability to continue due to two programs or devices each requiring a response from the other before completing an operation. 

verb
  • To cause or come to a deadlock. 

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