slow down vs unbend

slow down and unbend both are verbs.

Word	Noun	Adjective	Verb	Adverb
slow down	No	No	Yes	No
unbend	No	No	Yes	No

As verbs, slow down and unbend are synonyms defined as:

Other synonyms of slow down include decompress, loosen up, relax, unwind.

slow down (verb)	unbend (verb)
become less tense, rest, or take one's ease	release from mental strain, tension, or formality
lose velocity; move more slowly	become less tense, rest, or take one's ease
become slow or slower	make less taut
reduce the speed of	free from flexure
cause to proceed more slowly	unfasten, as a sail, from a spar or a stay
	straighten up or out; make straight