flee vs take off

flee

verb
  • To escape from. 

  • To run away; to escape. 

  • To disappear quickly; to vanish. 

take off

verb
  • To depart. 

  • To absent oneself from (work or other responsibility), especially with permission. 

  • To quantify. 

  • To remove. 

  • To leave the ground and begin flight; to ascend into the air. 

  • To imitate, often in a satirical manner. 

  • To become successful, to flourish. 

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