<p><strong>Verb (used without object)</strong></p><ul><li>to burn with an unsteady, swaying flame, as a torch or candle in the wind.</li><li>to blaze with a sudden burst of flame (often followed by up): The fire flared up as the paper caught.</li><li>to start up or burst out in sudden, fierce intensity or activity (often followed by up): His stomach problems have flared up.</li><li>to become suddenly enraged; express sudden, fierce anger or passion (usually followed by up or out): I’m not a person who flares easily. She sometimes flares out at the kids.</li><li>to shine or glow.</li><li>to spread gradually outward, as the end of a trumpet, the bottom of a wide skirt, or the sides of a ship.</li></ul><p><strong>Noun</strong></p><ul><li>a flaring or swaying flame or light, as of torches in the wind.</li><li>a sudden blaze or burst of flame.</li><li>a bright blaze of fire or light used as a signal, a means of illumination or guidance, etc.</li><li>a device or substance used to produce such a blaze of fire or light.</li><li>a sudden burst, as of zeal or of anger.</li><li>a gradual spread outward in form; outward curvature: the flare of a skirt.</li><li>something that spreads out.</li></ul>