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Definition of flash : 1. A pool.
2. A preparation of capsicum, burnt sugar, etc., for coloring and giving a fictious strength to liquors.
3. A reservoir and sluiceway beside a navigable stream, just above a shoal, so that the stream may pour in water as boats pass, and thus bear them over the shoal.
4. A sudden and brilliant burst, as of wit or genius; a momentary brightness or show.
5. A sudden burst of light; a flood of light instantaneously appearing and disappearing; a momentary blaze; as, a flash of lightning.
6. Showy, but counterfeit; cheap, pretentious, and vulgar; as, flash jewelry; flash finery.
7. Slang or cant of thieves and prostitutes.
8. The time during which a flash is visible; an instant; a very brief period.
9. To break forth, as a sudden flood of light; to burst instantly and brightly on the sight; to show a momentary brilliancy; to come or pass like a flash.
10. To burst forth like a sudden flame; to break out violently; to rush hastily.
11. To burst or break forth with a sudden and transient flood of flame and light; as, the lighting flashes vividly; the powder flashed.
12. To convey as by a flash; to light up, as by a sudden flame or light; as, to flash a message along the wires; to flash conviction on the mind.
13. To cover with a thin layer, as objects of glass with glass of a different color. See Flashing, n., 3 ( b).
14. To send out in flashes; to cause to burst forth with sudden flame or light.
15. To trick up in a showy manner.
16. Wearing showy, counterfeit ornaments; vulgarly pretentious; as, flash people; flash men or women; - applied especially to thieves, gamblers, and prostitutes that dress in a showy way and wear much cheap jewelry.

Synonyms:

photograph, pelt, flashy, sport, consume, scud, New York minute, trot, wink, burn, pip, jazzy, puffiness, inexpensive, nictate, smash, parade, twinkle, incinerate, hasten, burst, pomposity, rush, gimcrack, dart, singe, photoflash, blink of an eye, rip, garish, winkle, pulse, brandish, bum, winking, sleazy, newsbreak, flash bulb, scare off, tear, tucket, bolt, streak, scare, scour, audacious, punk, rocket, reflection, brasslike, whiz, coruscate, barefaced, rubbishy, nip, glare, beat, second, ratty, scoot, whirl, pulsation, chintzy, show off, flit, rack, scorch, ostentation, splashiness, fleet, bourgeon, crash, move, blast, fritter, set fire to, race, exhibit, nictitation, cheap, imprint, cremate, continue, fool, frighten off, flashbulb, inject, snap, bald-faced, ostentate, shoot, flair, brazen, trashy, char, glimmer, blink away, moment, fritter away, frivol away, dissipate, bodacious, film, tinny, sporty, whisk, display, tacky, frighten away, dazzle, hustle, zoom, take, gaudy, split second, flashing, shabby, tatty, instant, minute, flutter, fool away, blink, spark, news bulletin, ostentatiousness, flare pass, swank, barrel, phosphorescence, pompousness, eye blink, newsflash, festinate, glister, sprint, crummy, hotfoot, hurry, impulse, bucket, ignite, shoot down, loud, shoddy, show, pencil, glisten, scare away, forte, specious, fanfare, expose, cheapjack, flash lamp, burgeon forth, vision, brassy, pullulate, solar flare, sail, in poor taste, bustle, pall, flaunt, highball, set on fire, tasteless, jiffy, flicker, nictation, fly, kindle, shimmer, moth-eaten, winkle out, tawdry, brand, nictitate, spangle, cheesy, run, zip, cauterize, glance, inflation, germinate, speed, daunt, stream, pretentiousness, wing, coruscation, insolent, brazen-faced, flame, flashgun, sprout, disport, meretricious, blinking, spud, showy, flourish, chinchy, hit, gilded, buck, dash, charge, ray

brilliance, gleam, fire, illumination, glow, light, blaze, luminousness, luster, fluoresce, spot, radiation, glitter, flood, scintillation, incandescence, radiate, glint, shine, flare, illuminate, incandesce, scintillate, sparkle, beam, lucidity, brightness

suddenness, instantaneousness, trice, twinkling, immediacy, quickness, heartbeat, haste

communication, announcement, information, epistle, news, message, rumor, notice, bulletin, dispatch, release, statement, account, gossip, report

Usage examples:

• I will flash my light as I go along, and look." - "Six Little Bunkers at Cousin Tom's", Laura Lee Hope.
• Yes, in that flash we saw them all, for they were immediately below us. - "The White Shield", Bertram Mitford.
• She was still on guard for some flash of the joke that he was always playing. - "The Main Chance", Meredith Nicholson.