flare - noun

a shape that spreads outward

a sudden burst of flame

a burst of light used to communicate or illuminate

reddening of the skin spreading outward from a focus of infection or irritation

a sudden recurrence or worsening of symptoms

a sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference

am unwanted reflection in an optical system (or the fogging of an image that is caused by such a reflection)

a sudden outburst of emotion

a device that produces a bright light for warning or illumination or identification

a short forward pass to a back who is running toward the sidelines

(baseball) a fly ball hit a short distance into the outfield

flare - verb

• burn brightly
• become flared and widen, usually at one end
• shine with a sudden light
• erupt or intensify suddenly

flare - thesaurus

erupt   flair   flame   flash   irrupt