recrudesce

/ˌriːkruːˈdɛs/
verb
  1. To break out again after a period of inactivity; to become active or violent again, especially of something unpleasant.
    • The old conflict recrudesced when the two groups could not agree on land rights.
    • Doctors warned that the disease could recrudesce if people stopped getting vaccinated.
    • Violence recrudesced in the region after the peace talks failed.
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