unbend

verb

1. straighten up or out; make straight
2. unfasten, as a sail, from a spar or a stay
3. free from flexure"unbend a bow"
4. make less taut"relax the tension on the rope"
5. become less tense, rest, or take one's ease"He relaxed in the hot tub"
6. release from mental strain, tension, or formality"unbend the mind from absorbing too much information"