roll out vs unfurl

roll out

verb
  • To deploy or release (a new film or software, etc.); to launch (a product or service), especially in a gradual fashion across multiple regions. 

  • Used other than figuratively or idiomatically: see roll, out. 

unfurl

verb
  • To roll out or debut anything. 

  • To open up by unrolling. 

  • To turn out or unfold; to evolve; to progress. 

  • To unroll or release something that had been rolled up, typically a sail or a flag. 

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