pairing off vs tournament

pairing off

tournament

noun
  • During the Middle Ages, a series of battles and other contests designed to prepare knights for war. 

  • A series of games; either the same game played many times, or a succession of games related by a single theme; played competitively to determine a single winning team or individual. 

  • A digraph obtained by assigning a direction to each edge in an undirected complete graph. 

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