flare_up
1. [ verb ] erupt or intensify suddenly
Synonyms: erupt burst_out break_open irrupt flare
Examples:

"Unrest erupted in the country" "Tempers flared at the meeting" "The crowd irrupted into a burst of patriotism"

Related terms: intensify outburst
2. [ verb ] ignite quickly and suddenly, especially after having died down
Examples:

"the fire flared up and died down once again"

Related terms: ignite kindle
3. [ verb ] become suddenly excited or angry
Synonyms: flare erupt
Examples:

"She flares up easily"

Related terms: appear erupt
Similar spelling:   flare-up
  flare_path
  flare_pass