Meaning : Straighten up or out. Make straight.

Synonyms : straighten

Meaning : Unfasten, as a sail, from a spar or a stay.

Meaning : Free from flexure.

Example : Unbend a bow.

Meaning : Make less taut.

Example : Relax the tension on the rope.

Synonyms : relax

Meaning : Become less tense, rest, or take one's ease.

Example : He relaxed in the hot tub.
Let's all relax after a hard day's work.

Synonyms : decompress, loosen up, relax, slow down, unwind

Meaning : Release from mental strain, tension, or formality.

Example : Unbend the mind from absorbing too much information.