fly the coop vs turn tail

fly the coop

verb
  • To depart hastily or unannounced; to escape or flee. 

  • To escape from a pen or similar enclosure. 

turn tail

verb
  • To turn away from someone or something, in preparation for running away; to reverse direction; to leave or flee. 

How often have the words fly the coop and turn tail occurred in a corpus of books? (source: Google Ngram Viewer )