keep aloof vs quail

keep aloof

quail

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

  • To waste away; to fade, to wither. 

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

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. 

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