initiate vs open up

initiate

verb
  • To begin; to start. 

  • To instruct in the rudiments or principles; to introduce. 

  • To do the first act; to perform the first rite; to take the initiative. 

  • To confer membership on; especially, to admit to a secret order with mysterious rites or ceremonies. 

noun
  • One who is oriented in and familiar with a topic or subject; especially, one who is an expert in it. 

  • A new member of an organization. 

  • One who has been through a ceremony of initiation. 

open up

verb
  • To open. 

  • 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 widen. 

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

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