quail vs shun

quail

verb
  • To lose heart or courage; to be daunted or fearful. 

  • Of courage, faith, etc.: to slacken, to give way. 

  • To waste away; to fade, to wither. 

noun
  • The meat from this bird eaten as food. 

  • Any of various small game birds of the genera Coturnix, Anurophasis or Perdicula in the Old World family Phasianidae or of the New World family Odontophoridae. 

shun

verb
  • To escape (a threatening evil, an unwelcome task etc). 

  • To screen, hide. 

  • To avoid, especially persistently; ostracize. 

  • To shove, push. 

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