To backslide is to revert to a worse state. An alcoholic who quit drinking but than starts again is backsliding.

If you’re sliding back, you’re not going forward or even staying in the same place. That should help you remember that backsliding is a lapse in behavior or standards. If you backslide, you’re reverting to past behavior that was not good. A husband cheating for the second time is backsliding. A reformed criminal going back to crime is backsliding. When you backslide, you slip to a lower level. Backsliding is the opposite of making progress.

Definitions of backslide

v drop to a lower level, as in one's morals or standards

Type of:
drop away, drop off, fall away, slip
get worse

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