— backslider , n.
/bak"sluyd'/ , v. , backslid, backslid or backslidden, backsliding , n.
v.i.
1. to relapse into bad habits, sinful behavior, or undesirable activities.
n.
2. an act or instance of backsliding: a backslide from his early training.
[ 1575-85; BACK 2 + SLIDE ]