unbend

Etymology

From Middle English unbenden, equivalent to un- + bend.

verb

1. To remove a bend so as to make, or allow to become, straight.
   to unbend a bow
   He leant tensely against the corridor wall and frowned like a man trying to unbend a corkscrew by telekinesis. 1982, Douglas Adams, Life, the Universe and Everything, page 61
2. To release (a load) from a strain or from exertion; to set at ease for a time; to relax.
   to unbend the mind from study or care
3. (nautical) To unfasten sails from the spars or stays to which are attached for use.
4. To cast loose or untie
   Unbend the rope.
5. To cease to be bent; to become straight.
6. To relax in exertion, attention, severity, or the like
7. (archaic) to enjoy oneself; to become affable and free from formality