flare up
phrasal verbflare up
- (of flames, a fire, etc.) to suddenly start burning more brightly
- He put more logs on the fire and watched it flare up again.
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- (of a person) to suddenly become angry
- She flares up at the slightest provocation.
- (of an illness, injury, etc.) to suddenly start again or become worse
- His eczema has flared up again.
related noun flare-up (2)