Definitions from Wiktionary ( )

▸ verb:  (transitive) To cause to shine briefly or intermittently.
▸ verb:  (intransitive) To blink; to shine or illuminate intermittently.
▸ verb:  (intransitive) To be visible briefly.
▸ verb:  (transitive) To make visible briefly.
▸ verb:  (transitive, intransitive, informal) To expose one's intimate body part or undergarment, often momentarily and unintentionally. (Contrast streak.)
▸ verb:  (figurative) To break forth like a sudden flood of light; to show a momentary brilliance.
▸ verb:  To flaunt; to display in a showy manner.
▸ verb:  To communicate quickly.
▸ verb:  To move, or cause to move, suddenly.
▸ verb:  (transitive) To telephone a person, only allowing the phone to ring once, in order to request a call back.
▸ verb:  (intransitive, of liquid) To evaporate suddenly. (See flash evaporation.)
▸ verb:  (transitive, climbing) To climb (a route) successfully on the first attempt.
▸ verb:  (transitive, computing) To write to the memory of (an updatable component such as a BIOS chip or games cartridge).
▸ verb:  (transitive, glassmaking) To cover with a thin layer, as objects of glass with glass of a different colour.
▸ verb:  (transitive, glassmaking) To expand (blown glass) into a disc.
▸ verb:  (transitive) To send by some startling or sudden means.
▸ verb:  (intransitive) To burst out into violence.
▸ verb:  (juggling) To perform a flash.
▸ verb:  (metallurgy) To release the pressure from a pressurized vessel.
▸ verb:  (transitive, obsolete) To trick up in a showy manner.
▸ verb:  (transitive, obsolete) To strike and throw up large bodies of water from the surface; to splash.
▸ noun:  A sudden, short, temporary burst of light.
▸ noun:  A very short amount of time.
▸ noun:  (colloquial, US) A flashlight; an electric torch.
▸ noun:  (figuratively) A sudden and brilliant burst, as of genius or wit.
▸ noun:  (figurative, uncountable) Pizzazz, razzle-dazzle.
▸ noun:  Material left around the edge of a moulded part at the parting line of the mould.
▸ noun:  (British, Cockney) The strips of bright cloth or buttons worn around the collars of market traders.
▸ noun:  (juggling) A pattern where each prop is thrown and caught only once.
▸ noun:  (linguistics) A language, created by a minority to maintain cultural identity, that cannot be understood by the ruling class.
▸ noun:  (archaic) A preparation of capsicum, burnt sugar, etc., for colouring liquor to make it look stronger.
▸ noun:  (military) A form of military insignia.
▸ noun:  Any of various lycaenid butterflies of the genera Artipe, Deudorix and Rapala.
▸ noun:  A tattoo flash (example design on paper to give an idea of a possible tattoo).
▸ noun:  The sudden sensation of being "high" after taking a recreational drug.
▸ noun:  Synonym of flashback (“recurrence of the effects of a hallucinogenic drug”)
▸ noun:  (dated) A newsflash.
▸ noun:  A brief exposure or making visible (of a smile, badge, etc).
▸ noun:  The (intentional or unintentional) exposure of an intimate body part or undergarment in public.
▸ adjective:  (British, Australia and New Zealand, slang) Expensive-looking and demanding attention; stylish; showy.
▸ adjective:  (UK, of a person) Having plenty of ready money.
▸ adjective:  (UK, of a person) Liable to show off expensive possessions or money.
▸ adjective:  (US, slang) Occurring very rapidly, almost instantaneously.
▸ adjective:  (slang, obsolete) Relating to thieves and vagabonds.
▸ noun:  A pool.
▸ noun:  (engineering) 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.
▸ noun:  (computing) A multimedia platform, most often used for adding animation and interactivity to webpages.
▸ noun:  (DC Comics) Any of various DC Comics superheroes who have the power of superspeed, derived from an energy called the Speed Force.
▸ noun:  (photography) Clipping of camera flash (“a device used to produce a flash of artificial light to help illuminate a scene”). [A device that produces a short flash of light to help illuminate a scene, mostly for night-time or indoors photography, to make the picture brighter.]
▸ noun:  (computing, uncountable) Clipping of flash memory. [(computer hardware) A rewritable memory chip that retains its data without a power supply.]
▸ noun:  (telecommunications) Short for hook flash. [(telecommunications) A signal that briefly disconnects the local loop circuit by means of the hookswitch or a dedicated button, used to control functions on the public telephone exchange.]

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