Burning brightly with sudden flames, or spreading outward in a wider shape.
From the verb 'flare,' which likely comes from Old Norse 'flaera' meaning to blaze or burn. The '-ing' suffix converts it to the present participle form, showing an action in progress.
Flaring is used by both astronomers (when the sun has sudden bright explosions) and fashion designers (when a skirt spreads out wider at the hem)—the same word describes completely different things because they both share that idea of sudden brightness or spreading outward!
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