recrudescence

/ˌriːkruːˈdɛsəns/
noun
  1. A new outbreak or return of something unpleasant, such as a disease, violence, or a problem, after a period of calm.
    • The country faced a recrudescence of ethnic tensions that had been dormant for years.
    • There was a recrudescence of street protests after the new law was passed.
    • The recrudescence of the flu in winter caught many people by surprise.
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