unbend

verb7

1. •
   To remove a bend so as to make, or allow to become, straight.

   • He leant tensely against the corridor wall and frowned like a man trying to unbend a corkscrew by telekinesis. — 1982
2. •
   To release (a load) from a strain or from exertion; to set at ease for a time; to relax.

   • You do unbend your noble strength. — 1606
3. •
   To relax in exertion, attention, severity, or the like

   • He spent the afternoon shaping a swagger-stick from the branch of jarrah and talking with Miss La Rue, who had sufficiently unbent toward him to notice his existence. — 1918
4. •
   to enjoy oneself; to become affable and free from formality
5. •
   To cease to be bent; to become straight.
6. •
   To unfasten sails from the spars or stays to which are attached for use.
7. •
   To cast loose or untie

   • Unbend the rope.