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English definition of “flare”

flare

verb [I] (GET WORSE)    /fleər/ US  /fler/ (also flare up)
When something bad such as violence, pain, or anger flares (up), it suddenly starts or gets much worse: Violence flared up again last night. Tempers flared after a three-hour delay at Gatwick Airport yesterday.Exploding and erupting
(Definition of flare verb (GET WORSE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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