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English definition of “relapse”

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relapse

verb [I] uk   /rɪˈlæps/ formal us  
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.

relapse

noun [C] uk   /ˈriː.læps/ formal us  
If someone who is getting better after an illness has a relapse, they become ill again: She was looking quite healthy on Friday, but she had/suffered a relapse over the weekend and was taken back into hospital.
(Definition of relapse from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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