Etymology
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retrogress (v.)

"move backward; deteriorate," 1816, probably a back-formation from retrogression. Related: Retrogressed; retrogressing.

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Definitions of retrogress

retrogress (v.)
get worse or fall back to a previous condition;
Synonyms: regress / retrograde
retrogress (v.)
go back to bad behavior;
Synonyms: relapse / lapse / recidivate / regress / fall back
From wordnet.princeton.edu