a sudden burst of flame or light; a sudden idea, realization etc
shimmer, flicker
Cases of word usage
1) a flash of bright light produced by natural electricity between clouds in the sky or clouds and the ground, often with thunder (lightning)
2) the noise which usually follows a flash of lightning; to say (something) in a loud, serious voice (thunder)
3) to close and open one eye as a signal; (of a star, light etc) to shine or flash at very short intervals (wink)
