What is the meaning of Backslide?

To regress; to slip backwards or revert to a previous, worse state.

To shirk responsibility; to renege on one's obligations or commitments.

To revert back into a life of sin after being saved.

A backward regression; a reverting back to a worse state.

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.

Source: wiktionary.org