unbind vs untrammel

unbind

verb
  • To set free from a debt, contract or promise. 

  • To disable some kind of connection in software, such as a key binding. 

  • To take bindings off. 

untrammel

verb
  • To free or release from obstacles or hindrances. 

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