Definitions from Wiktionary (flare-up)

▸ noun:  A sudden outbreak, outburst or eruption (originally of flame, but now used more generally of any violent activity or emotion).
▸ noun:  A sudden intensification in activity.
▸ noun:  An inflammation such as of tendons (tendonitis) or joints (osteoarthritis).
▸ Also see flare-up

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