to revert to an earlier or less advanced state or form.
–noun
3.
the act of going back; return.
4.
the right to go back.
5.
backward movement or course; retrogression.
Origin: 1325–75; ME regresse (n.) < L regressus a returning, going back, equiv. to re-re-+ -gred-, comb. form of gradī to step, walk, go + -tus suffix of v. action, with dt > ss