ern vs hotfoot

ern

verb
  • To run; flow. 

  • To (cause to) coagulate; curdle (milk) by adding rennet and applying heat. 

  • To pain; torture. 

  • (of the eyes) To cause to water; smart. 

hotfoot

verb
  • To run (a distance). 

adv
  • Hastily; without delay. 

adj
  • Moving with haste or zeal. 

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

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