flare up

Verb
  1. Ignite quickly and suddenly, especially after having died down (synset 202770203)
    "the fire flared up and died down once again"
  2. Erupt or intensify suddenly (synset 200308567)
    "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"

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