don vs unfasten

don

verb
  • To put on clothing; to dress (oneself) in an article of personal attire. 

noun
  • An employee of a university residence who lives among the student residents. 

  • A mafia boss. 

  • Any man, bloke, dude. 

  • A university professor, particularly one at Oxford or Cambridge. 

unfasten

verb
  • To come unloosed or untied. 

  • To detach from any connecting agency or link; to disconnect. 

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