Relapser

re·lapse  (r-lps)

intr.v. re·lapsed, re·laps·ing, re·laps·es

1. To fall or slide back into a former state.

2. To regress after partial recovery from illness.

3. To slip back into bad ways; backslide.

n. (rlps, r-lps)

A falling back into a former state, especially after apparent improvement.

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[Middle English relapsen, to forswear, from Latin relb, relps-, to fall back gradually : re-, re- + lb, to slide.]

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re·lapser n.