verb To regress; to slip backwards or revert to a previous, worse state.
He felt better for a little while, before his condition started to backslide.
verb To shirk responsibility; to renege on one's obligations or commitments.
verb To revert back into a life of sin after being saved.
noun A backward regression; a reverting back to a worse state.
noun 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.