unbend

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.

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

You do unbend your noble strength.

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

To cast loose or untie

Unbend the rope.

To cease to be bent; to become straight.