Unbend

to unbend a bow

He leant tensely against the corridor wall and frowned like a man trying to unbend a corkscrew by telekinesis.

to unbend the mind from study or care

You do unbend your noble strength.

Unbend the rope.

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.