disengage vs unshackle

disengage

verb
  • To release or loosen from something that binds, entangles, holds, or interlocks. 

noun
  • A circular movement of the blade that avoids the opponent's parry 

unshackle

verb
  • To remove shackles from someone or something. 

  • To remove restrictions or inhibitions; to allow full freedom and power. 

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