break in vs bring to heel

break in

verb
  • To tame; make obedient; to train to follow orders of the owner. 

  • Starting something brand new or at a new level. 

  • To cause (something, or someone, new) to function more naturally through use or wear 

  • To take the virginity of a girl, to deflower. 

  • To enter a place by force or illicit means. 

  • To interrupt one's conversation; speak before another person has finished speaking. 

bring to heel

verb
  • To cause to act in a disciplined manner. 

  • To compel someone to obey; to force someone into a submissive condition. 

How often have the words break in and bring to heel occurred in a corpus of books? (source: Google Ngram Viewer )