Unbend

To free from flexure; to make, or allow to become, straight; to loosen; as, to unbend a bow.

A remit from a strain or from exertion; to set at ease for a time; to relax; as, to unbend the mind from study or care.

To unfasten, as sails, from the spars or stays to which they are attached for use.

To cast loose or untie, as a rope.

To cease to be bent; to become straight or relaxed.

To relax in exertion, attention, severity, or the like; hence, to indulge in mirth or amusement.