Verb
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.
Source: Webster's dictionaryA man, though wise, should never be ashamed of learning more, and must unbend his mind. Sophocles
He relaxed in the hot tub Source: Internet
Let's all relax after a hard day's work Source: Internet
relax the tension on the rope Source: Internet
unbend the mind from absorbing too much information Source: Internet
unbend a bow Source: Internet