sit back vs decompress

sit back and decompress both are verbs.

Word	Noun	Adjective	Verb	Adverb
sit back	No	No	Yes	No
decompress	No	No	Yes	No

As verbs, decompress is a hypernym of sit back; that is, decompress is a word with a broader meaning than sit back:

Other hypernyms of sit back include loosen up, relax, slow down, unbend, unwind.

sit back (verb)	decompress (verb)
settle into a comfortable sitting position	become less tense, rest, or take one's ease
be inactive or indifferent while something is happening	decrease the pressure of
	restore to its uncompressed form