Regress
Part of speech: noun
Definition: The act of passing back; passage back; return; retrogression. The power or liberty of passing back.
Part of speech: verb
Definition: To move backwards to an earlier stage; to devolve. To perform a regression on an explanatory variable.
Retrogress
Part of speech: verb
Definition: To return to an earlier, simpler or worse condition; to regress.To go backwards; to retreat.To return to bad behaviour; to relapse.