To slip or slide back, in a literal sense; to turn back.
To slide or turn back into a former state or practice; to fall back from some condition attained; -- generally in a bad sense, as from a state of convalescence or amended condition; as, to relapse into a stupor, into vice, or into barbarism; -- sometimes in a good sense; as, to relapse into slumber after being disturbed.
To fall from Christian faith into paganism, heresy, or unbelief; to backslide.
A sliding or falling back, especially into a former bad state, either of body or morals; backsliding; the state of having fallen back.
One who has relapsed, or fallen back, into error; a backslider; specifically, one who, after recanting error, returns to it again.
Part of recovery is relapse. I dust myself off and move forward again. Steven Adler
The other thing is that if you rely solely on medication to manage depression or anxiety, for example, you have done nothing to train the mind, so that when you come off the medication, you are just as vulnerable to a relapse as though you had never taken the medication. Daniel Goleman
Nothing on 'Relapse' and very little on 'Recovery' was produced by me. Eminem
Great effort is required to arrest decay and restore vigor. One must exercise proper deliberation, plan carefully before making a move, and be alert in guarding against relapse following a renaissance. Horace
Rather than viewing a brief relapse back to inactivity as a failure, treat it as a challenge and try to get back on track as soon as possible. Jimmy Connors