big picture vs purport

big picture

noun
  • The totality of a situation. 

  • Used other than figuratively or idiomatically: see big, picture. 

purport

noun
  • import, intention or purpose 

verb
  • To intend. 

  • To convey, imply, or profess (often falsely or inaccurately). 

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