hotfoot vs pound the pavement

hotfoot

verb
  • To run (a distance). 

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

adj
  • Moving with haste or zeal. 

adv
  • Hastily; without delay. 

pound the pavement

verb
  • To travel on foot; to walk or run. 

  • To campaign diligently; to seek something, such as business, employment, or answers. 

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