v. 25B6; verb many things can cause slimmers to backslide : RELAPSE, lapse, regress, retrogress, weaken, lose one's resolve, give in to temptation, go astray, leave the straight and narrow.
persevere.
BACKSLIDE
Meaning of BACKSLIDE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012