Etymology
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relapse (v.)

early 15c., relapsen, "renounce" (a vice, etc.), a sense now obsolete; 1560s as "fall into a former (bad) state or practice," from Latin relapsus, past participle of relabi "slip back, slide back, sink back," from re- "back" (see re-) + labi "to slip" (see lapse (n.)). Related: Relapsed; relapsing.

relapse (n.)

mid-15c., "a falling back into error or wrongdoing, moral backsliding," from relapse (v.) or else from Medieval Latin relapsus. In medicine, "a falling back into a disease or symptom during or after convalescence," from 1580s.

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Definitions of relapse
1
relapse (v.)
deteriorate in health;
he relapsed
Synonyms: get worse
relapse (v.)
go back to bad behavior;
Synonyms: lapse / recidivate / regress / retrogress / fall back
2
relapse (n.)
a failure to maintain a higher state;
Synonyms: backsliding / lapse / lapsing / relapsing / reversion / reverting
From wordnet.princeton.edu