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Verb: flare up
  1. Ignite quickly and suddenly, especially after having died down
    "the fire flared up and died down once again"
     
  2. Erupt or intensify suddenly
    "Unrest flared up in the country";
    - erupt, irrupt, flare, break open, burst out
Noun: flare-up  flehr úp
  1. A sudden intense happening
    "The flare-up of tensions between the two countries worried diplomats";
    - outburst, burst

Derived forms: flares up, flaring up, flare-ups, flared up

Type of: deepen, happening, ignite, intensify, light, natural event, occurrence, occurrent

Encyclopedia: Flare-up