don vs unbutton

don

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. 

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

unbutton

verb
  • To open (something) by undoing its buttons. 

  • To come open by having its buttons unfastened. 

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