bring to heel vs gentle

bring to heel

verb
  • To cause to act in a disciplined manner. 

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

gentle

verb
  • To soothe; to calm; to make gentle. 

  • To break; to tame; to domesticate. 

  • To become gentle. 

noun
  • A trained falcon, or falcon-gentil. 

  • A maggot used as bait by anglers. 

adj
  • Soft and mild rather than hard or severe. 

  • Tender and amiable; of a considerate or kindly disposition. 

  • Polite and respectful rather than rude. 

  • Gradual rather than steep or sudden. 

  • Docile and easily managed. 

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