disengage vs unscrew

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 

unscrew

verb
  • To loosen a screw or thing by turning it. 

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