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flare1

1 also flare up [intransitive] to suddenly begin to burn, or to burn more brightly for a short time :
The fire flared up again.
The fire flared up again.2 also flare up [intransitive] if strong feelings flare or flare up, people suddenly become angry, violent etc :
Rioting has flared up in several towns.
Rioting has flared up in several towns.3 also flare up [intransitive] if a disease or illness flares up, it suddenly becomes worse :
The injury has flared up again, keeping him out of today's game.
The injury has flared up again, keeping him out of today's game.4 [intransitive and transitive] if a person or animal flares their nostrils (=the openings at the end of the nose), or if their nostrils flare, their nostrils become wider because they are angry :
The bull flared its nostrils.
The bull flared its nostrils.5 [intransitive always + adverb/preposition] if a piece of clothing flares out, it becomes wider at one end
—flared adjective:
flared jeans
flared jeans