unbend vs unfurl

unbend

verb
  • To unfasten sails from the spars or stays to which are attached for use. 

  • To remove a bend so as to make, or allow to become, straight. 

  • To cast loose or untie 

  • To cease to be bent; to become straight. 

  • To relax in exertion, attention, severity, or the like 

  • To release (a load) from a strain or from exertion; to set at ease for a time; to relax. 

unfurl

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

  • To roll out or debut anything. 

  • To open up by unrolling. 

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

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