hundred-to-one shot vs underdog

hundred-to-one shot

underdog

noun
  • A high swing wherein the person pushing the swing runs beneath the swing while the person being pushed is at the forward limit of the arc. 

  • Somebody at a disadvantage. 

  • A competitor thought unlikely to win. 

How often have the words hundred-to-one shot and underdog occurred in a corpus of books? (source: Google Ngram Viewer )