covert vs hotfoot

covert

noun
  • A disguise. 

  • A covering. 

  • A feather that covers the bases of flight feathers. 

  • Area of thick undergrowth where animals hide. 

  • A hiding place. 

adj
  • Under coverture. 

  • Secret, surreptitious, concealed. 

hotfoot

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. 

verb
  • To run (a distance). 

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