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flare-up [countable]
1 a situation in which someone suddenly becomes angry or violent :
Apart from one or two flare-ups the match went fairly smoothly.
Apart from one or two flare-ups the match went fairly smoothly.2 a situation in which someone suddenly has problems because of a disease or illness after not having any problems for a long time :
a flare-up of her arthritis
a flare-up of her arthritis