breakthrough vs hotfoot

breakthrough

adj
  • Characterized by major progress or overcoming some obstacle. 

  • Involving the contraction of a disease by a person with a decreased susceptibility, such as a person who has been vaccinated to help prevent that disease. 

  • The emergence or one or more symptoms of a condition despite medication or other medical treatment. 

noun
  • The penetration of the opposition's defence. 

  • An advance through and past enemy lines. 

  • Any major progress; such as a great innovation or discovery that overcomes a significant obstacle. 

  • The penetration of a separating wall or the remaining distance to an adjacent hollow (a crosscut in mining) or between two parts of a tunnel build from both ends; knockthrough. 

hotfoot

adj
  • Moving with haste or zeal. 

adv
  • Hastily; without delay. 

noun
  • The prank of secretly inserting a match between the sole and upper of a victim's shoe and then lighting it. 

verb
  • To run (a distance). 

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