Meaning : Straighten up or out. Make straight.
Synonyms : straighten
Meaning : Unfasten, as a sail, from a spar or a stay.
Meaning : Free from flexure.
Unbend a bow.
Meaning : Make less taut.
Relax the tension on the rope.
Synonyms : relax
Meaning : Release from mental strain, tension, or formality.
Unbend the mind from absorbing too much information.