(transitive) To cause to shine briefly or intermittently.
(intransitive) To blink; to shine or illuminate intermittently.
(intransitive) To be visible briefly.
(transitive) To make visible briefly.
(ambitransitive, informal) To expose one's intimate body part or undergarment, often momentarily and unintentionally. (Contrast streak.)
(figuratively) To break forth like a sudden flood of light; to show a momentary brilliance.
To flaunt; to display in a showy manner.
To communicate quickly.
To move, or cause to move, suddenly.
(transitive) To telephone a person, only allowing the phone to ring once, in order to request a call back.
(intransitive) To evaporate suddenly. (See flash evaporation.)
(transitive) To climb (a route) successfully on the first attempt.
(transitive) To write to the memory of (an updatable component such as a BIOS chip or games cartridge).
(transitive) To cover with a thin layer, as objects of glass with glass of a different colour.
(transitive) To expand (blown glass) into a disc.
(transitive) To send by some startling or sudden means.
(intransitive) To burst out into violence.
To perform a flash.
To release the pressure from a pressurized vessel.
(obsolete, transitive) To trick up in a showy manner.
(obsolete, transitive) To strike and throw up large bodies of water from the surface; to splash.
To flash back.

(countable, uncountable) A sudden, short, temporary burst of light.
(countable, uncountable) A very short amount of time.
(US, colloquial, countable, uncountable) A flashlight; an electric torch.
(countable, figuratively, uncountable) A sudden and brilliant burst, as of genius or wit.
(figuratively, uncountable) Pizzazz, razzle-dazzle.
(countable, uncountable) Material left around the edge of a moulded part at the parting line of the mould.
(British, Cockney, countable, uncountable) The strips of bright cloth or buttons worn around the collars of market traders.
(countable, uncountable) A pattern where each prop is thrown and caught only once.
(countable, uncountable) A language, created by a minority to maintain cultural identity, that cannot be understood by the ruling class.
(abbreviation, alt-of, clipping, countable, uncountable) Clipping of camera flash (“a device used to produce a flash of artificial light to help illuminate a scene”).
(archaic, countable, uncountable) A preparation of capsicum, burnt sugar, etc., for colouring liquor to make it look stronger.
(countable, uncountable) A form of military insignia.
(abbreviation, alt-of, clipping, uncountable) Clipping of flash memory.
(countable, uncountable) Any of various lycaenid butterflies of the genera Artipe, Deudorix and Rapala.
(countable, uncountable) A tattoo flash (example design on paper to give an idea of a possible tattoo).
(countable, uncountable) The sudden sensation of being "high" after taking a recreational drug.
(countable, uncountable) Synonym of flashback (“recurrence of the effects of a hallucinogenic drug”).
(countable, dated, uncountable) A newsflash.
(countable, uncountable) A brief exposure or making visible (of a smile, badge, etc).
(countable, uncountable) The (intentional or unintentional) exposure of an intimate body part or undergarment in public.
(abbreviation, alt-of, countable, ellipsis, uncountable) Ellipsis of hook flash.

(Australia, British, New-Zealand, slang) Expensive-looking and demanding attention; stylish; showy.
(UK) Having plenty of ready money.
(UK) Liable to show off expensive possessions or money.
(US, slang) Occurring very rapidly, almost instantaneously.
(obsolete, slang) Relating to thieves and vagabonds.

A pool of water, in some areas especially one that is marshy, and/or one formed by subsidence of the ground due to mining. (Compare flush (“marsh; 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.

flashes

flash

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