doff vs unsnib

doff

verb
  • To strip; to divest; to undress. 

  • To get rid of, to throw off. 

  • To remove or take off (something such as clothing). 

  • To remove or tip a hat, as in greeting, salutation or as a mark of respect. 

unsnib

verb
  • to undo, untie, or open or become undone, untied, or opened. 

  • Somehow she managed to unsnib the window and escape. 

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