noun
a deterioration in someone's state of health after a temporary improvement
verb
to suffer a relapse
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The patient experienced a relapse in their condition and had to be readmitted to the hospital.
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After months of staying sober, he had a relapse and started drinking again.
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She was doing so well with her diet until she had a relapse and ate a whole pizza.
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Just when it seemed like they were making progress, the team suffered a relapse in their performance.