Definition of "Unbend" :
verb: release from mental strain, tension, or formality
"Unbend the mind from absorbing too much information."
verb: become less tense, rest, or take one's ease
verb: make less taut
verb: free from flexure
"Unbend a bow."
verb: unfasten, as a sail, from a spar or a stay
verb: straighten up or out; make straight