4. (verb)relax, unbend make less taut "relax the tension on the rope"
5. (verb)relax, loosen up, unbend, unwind, decompress, slow down become less tense, rest, or take one's ease "He relaxed in the hot tub"; "Let's all relax after a hard day's work"
6. (verb)unbend release from mental strain, tension, or formality "unbend the mind from absorbing too much information"
Definition of 'unbend'
Webster Dictionary
1. (verb)unbend to free from flexure; to make, or allow to become, straight; to loosen; as, to unbend a bow
2. (verb)unbend 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
3. (verb)unbend to unfasten, as sails, from the spars or stays to which they are attached for use
4. (verb)unbend to cast loose or untie, as a rope
5. (verb)unbend to cease to be bent; to become straight or relaxed
6. (verb)unbend to relax in exertion, attention, severity, or the like; hence, to indulge in mirth or amusement
Definitions of unbend 
