ret·ro·gress 
(rĕtrə-grĕs′, rĕt′rə-grĕs)
(rĕtrə-grĕs′, rĕt′rə-grĕs)intr.v. ret·ro·gressed, ret·ro·gress·ing, ret·ro·gress·es
1. To return to an earlier, inferior, or less complex condition.
2. To go or move backward.
[Latin retrōgradī, *retrōgress- : retrō-, retro- + gradī, to go; see ghredh- in the Appendix of Indo-European roots.]
ret′ro·gression (-grĕshən) adj.
ret′ro·gressive adj.
re′tro·gressive·ly adv.