misunderstanding vs tug of war

misunderstanding

noun
  • A disagreement; difference of opinion; dissension; quarrel. 

  • A mistake as to the meaning of something or a specific point of view; erroneous interpretation or comprehension; misconception. 

tug of war

noun
  • A dispute between two parties, particularly an entrenched, back-and-forth dispute. 

  • A game or competition in which two teams pull or tug on opposite ends of a rope trying to force the other team over the line which initially marked the middle between the two teams. 

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