flare up
flare up {v.}
1. To burn brightly for a short time especially after having died down.
The fire flared up again and then died.
2. To become suddenly angry.
The mayor flared up at the reporter's remark.
The mother flared up at her children.
3. To begin again suddenly, especially for a short time after a quiet time.
Mr. Gray's arthritis flared up sometimes.
Even after they had conquered the country, revolts sometimes flared up.
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Source: A Dictionary of American Idioms
