a sudden flaring up of flame or light.
a sudden outburst or intensification, as of anger or tensions.
a sudden outbreak of violence, disease, or any other condition thought to be quelled, checked, or inactive.

1830–40; noun use of verb phrase flare up

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
We've witnessed a flareup of distributed anarchy implying an imprecise, but not unfounded contempt for the existing order.
Likewise, an irregular heart rhythm such as atrial fibrillation may cause a flareup.
It's evidently a flareup of an ailment that first cropped up in spring training and then again late last month.
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