open up vs restrict

open up

verb
  • To widen. 

  • Synonym of cheat out (“to face or turn toward the audience more than would be natural”) 

  • To begin running, driving, travelling, etc., at maximum speed. 

  • To commence firing weapons. 

  • To rain. 

  • To open. 

  • To reveal oneself; to share personal information about oneself; to become communicative. 

restrict

verb
  • To restrain within boundaries; to limit; to confine 

  • To consider (a function) as defined on a subset of its original domain. 

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