verb
(intransitive) To regress; to slip backwards or revert to a previous, worse state.
(transitive) To shirk responsibility; to renege on one's obligations or commitments.
(Christianity) To revert back into a life of sin after being saved.
noun
A backward regression; a reverting back to a worse state.
(dance) A dance move in which the feet are alternately slid back and the heels lifted, giving the illusion of walking forwards while actually moving backwards.