Flare – definition of flare by The Free Dictionary

flare (flâr) v. flared, flar·ing, flares v.intr. 1. To flame up with a bright, wavering light. 2. To burst into intense, sudden flame. 3. a. To erupt or intensify suddenly: Tempers flared at the meeting. His allergies flared up. b. To become suddenly angry. Used with up: He flared up when she alluded to his financial difficulties. c. To make a sudden …

: https://www.thefreedictionary.com/flare