Definition of regresses:
(v) :
(intransitive) To move backwards to an earlier stage; to devolve.
(v) :
(psychology) To re-develop behavior one had previously grown out of, particularly a behavior left behind in childhood.
(v) :
(intransitive, medicine) To reduce in severity or size (as of a tumor), without reaching total remission.
(n) :
The act of passing back; passage back; return; retrogression.
(n) :
The power or liberty of passing back.
(n) :
(property law) The right of a person (such as a lessee) to return to a property.