Webster's English Dictionary

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backslide

back.slide \-.sli-d\ \-.slid\ \-.slid-*n\ \-.sli-d-in\ \-.sli-d-*r\ vi or 
   back.slid;  or backslid;  or back.slid.den or back.slid.ing : to lapse 
   morally or in the practice of religion  - back.slid.er n