derogate vs disengage

derogate

verb
  • To take away (something from something else) in a way which leaves it lessened. 

  • To remove a part, to detract from (a quality of excellence, authority etc.). 

  • To act in a manner below oneself; to debase oneself. 

  • To detract from (something); to disparage, belittle. 

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 

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