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English definition of “relapse”

relapse

verb [I]     /rɪˈlæps/ formal
to become ill or start behaving badly again, after making an improvement: She managed to stop using drugs for a month, but then relapsed. He looked happy for a brief while, before relapsing into silent misery.Deteriorating and making worseBeing and falling ill
(Definition of relapse verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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