A slipping from a higher or better condition to a lower or poorer one
Why start backsliding now that you've made solid progress for six weeks straight?
Katie would think she was backsliding, but that was the way she felt.
They held up before a backsliding people the ideals of human duty, of religious truth and of national policy.
Carlyle was throughout a pessimist or a prophet denouncing a backsliding world.
Unrealistic expectations of dietary perfection only lead to disappointment, discouragement and backsliding.