fetter vs unstop

fetter

verb
  • To restrain or impede; to hamper. 

  • To shackle or bind up with fetters. 

noun
  • A chain or similar object used to bind a person or animal – often by its legs (usually in plural). 

  • Anything that restricts or restrains. 

unstop

verb
  • To remove a stoppage; to clear a blockage. 

  • To draw out the stops of (an organ). 

  • To unplug or uncork a container. 

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