1. (v.) To return to a former, worse condition; as, the progress and regress of civilization\.

2. (n.) The power or liberty of passing back.

3. (v. i.) To go back; to return to a former place or state.

about-face advance ascend back back up backing backset backslide backsliding backward motion backward step budge change change place circle climb cock come after come last degenerate descend deteriorate disenchantment disimprove ebb fall fall again into fall astern fall back fall behind fall from grace flip-flop flow follow get behind get over get worse go go around go back go backwards go behind go round go sideways grow worse gyrate have a relapse jerk back lag behind lapse lapse back let down lose ground mount move move over plunge progress pull back reaction recede recession recidivate recidivation recidivism reclamation reconversion recur to reentry refluence reflux regression rehabilitation reinstatement relapse restitution restoration retroaction retrocede retrocession retroflex retroflexion retrogradation retrograde retrogress retrogression retroversion retrovert retrusion return return to returning reversal reverse reversion revert revert to reverting revulsion rise rollback rotate run setback shift sicken sink sink back slacken slide back slip back slipping back soar spin sternway stir stream subside throw back throwback trail trail behind travel turn turnabout wane whirl worsen yield again to