capsize vs double back

capsize

verb
  • To overturn. 

  • To deform under stress. 

  • To cause (a ship) to overturn. 

noun
  • The act of, or occurrence of capsizing or overturning. 

double back

verb
  • To retrace one's steps; to go back where one has already gone. 

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