unbend

To release from mental tension, strain, or formality; relax.

To release (a bow, for example) from flexure or tension.

To untie or loosen (a rope or sail).

To straighten (something crooked or bent).

To become less tense; relax.

To become less strict.

To become straight.

To become relaxed or unbent.

To rid one’s self of constraint; act with freedom; give up stiffness or austerity of manner; be affable.

To free from flexure; make straight: as, to unbend a bow.