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flare-up

noun [C usually singular]
 
 
/ˈfleə.rʌp/ US  /ˈfler.ʌp/

Definition

a situation in which something such as violence, pain, or anger suddenly starts or gets much worse: There was another flare-up of rioting later that day.Beginnings and starts
(Definition of flare-up noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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