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