to burst or break forth with a sudden and transient flood of flame and light; as, the lighting flashes vividly; the powder flashed.-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.-to burst forth like a sudden flame; to break out violently; to rush hastily.-to send out in flashes; to cause to burst forth with sudden flame or light.-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.-to cover with a thin layer, as objects of glass with glass of a different color. see flashing, n., 3 (b).-to trick up in a showy manner.-to strike and throw up large bodies of water from the surface; to splash.-a sudden burst of light; a flood of light instantaneously appearing and disappearing; a momentary blaze; as, a flash of lightning.-a sudden and brilliant burst, as of wit or genius; a momentary brightness or show.-the time during which a flash is visible; an instant; a very brief period.-a preparation of capsicum, burnt sugar, etc., for coloring and giving a fictious strength to liquors.-showy, but counterfeit; cheap, pretentious, and vulgar; as, flash jewelry; flash finery.-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.-slang or cant of thieves and prostitutes.-a pool.-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.