hotfoot vs step on it

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. 

adv
  • Hastily; without delay. 

adj
  • Moving with haste or zeal. 

step on it

verb
  • To act quickly. 

  • To drive fast; to step on the accelerator. 

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