disengage vs draw back

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 

draw back

verb
  • to pull something back or apart 

  • to withdraw from an undertaking 

  • to move backwards 

  • to retreat from a position 

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