vt to cast loose or untie, as a rope.
2. unbend ·vi to cease to be bent; to become straight or relaxed.
3. unbend ·vt to unfasten, as sails, from the spars or stays to which they are attached for use.
4. unbend ·vi to relax in exertion, attention, severity, or the like; hence, to indulge in mirth or amusement.
5. unbend ·vt to free from flexure; to make, or allow to become, straight; to loosen; as, to unbend a bow.
6. unbend ·vt 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.