1.VerbTo regress; to slip backwards or revert to a previous, worse state.
"He felt better for a little while, before his condition started to backslide."
2.VerbTo shirk responsibility; to renege on one's obligations or commitments.
3.VerbTo revert back into a life of sin after being saved.
4.NounA backward regression; a reverting back to a worse state.
5.NounA dance move in which the feet are alternately slid back and the heels lifted, giving the illusion of walking forwards while actually moving backwards.