flare up

Verb (2)

1. ignite quickly and suddenly, especially after having died down“the fire flared up and died down once again”Synonyms: flare up
2. erupt or intensify suddenly“Unrest erupted in the country”“Tempers flared at the meeting”“The crowd irrupted into a burst of patriotism”Synonyms: eruptirruptflare upflarebreak openburst out