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Definition of flare up phrasal verb from the Oxford Advanced Learner's Dictionary

flare up

phrasal verb
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flare up
  1. (of flames, a fire, etc.) to suddenly start burning more brightly
    • He put more logs on the fire and watched it flare up again.
    related noun flare-up (3)
  2. (of a person) to suddenly become angry
    • She flares up at the slightest provocation.
    related noun flare-up (1)Topics Feelingsc2
  3. (of an illness, injury, etc.) to suddenly start again or become worse
    • His eczema has flared up again.
    4. related noun flare-up (2)
See flare up in the Oxford Advanced American Dictionary

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trait
noun
 
 
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B2
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