turn back vs retrogress

turn back and retrogress both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn back	No	No	Yes	No
retrogress	No	No	Yes	No

As verbs, retrogress is a hyponym of turn back; that is, retrogress is a word with a more specific, narrower meaning than turn back:

Other hyponyms of turn back include fall back, lapse, recidivate, regress, relapse, resile, go back, recover, recuperate.

turn back (verb)	retrogress (verb)
go back to a previous state	go back to bad behavior
turn inside out or upside down	get worse or fall back to a previous condition
hold back, as of a danger or an enemy; check the expansion or influence of
retrace one's course
force to go away; used both with concrete and metaphoric meanings