| flash | (adjective) tastelessly showy | Synonyms: brassy, cheap, flashy, garish, gaudy, gimcrack, loud, meretricious, tacky, tatty, tawdry, trashy |
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| (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash bulb, flash lamp, flashbulb, flashgun, photoflash |
| (noun) a bright patch of color used for decoration or identification | - |
| (noun) a momentary brightness | - |
| (noun) a sudden brilliant understanding | - |
| (noun) a short news announcement concerning some on-going news story | Synonyms: news bulletin, newsbreak, newsflash |
| (noun) a burst of light used to communicate or illuminate | Synonyms: flare |
| (noun) a gaudy outward display | Synonyms: fanfare, ostentation |
| (noun) a sudden intense burst of radiant energy | - |
| (noun) a short vivid experience | Synonyms: flashing |
| (noun) a very short time (as the time it takes the eye to blink or the heart to beat) | Synonyms: blink of an eye, heartbeat, instant, jiffy, New York minute, split second, trice, twinkling, wink |
| (verb) appear briefly | - |
| (verb) emit a brief burst of light | - |
| (verb) make known or cause to appear with great speed | - |
| (verb) protect by covering with a thin sheet of metal | - |
| (verb) run or move very quickly or hastily | Synonyms: dart, dash, scoot, scud, shoot |
| (verb) gleam or glow intermittently | Synonyms: blink, twinkle, wink, winkle |
| (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flaunt, ostentate, show off, swank |
| (verb) expose or show briefly | - |
| flashback | (noun) a transition (in literary or theatrical works or films) to an earlier event or scene that interrupts the normal chronological development of the story | - |
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| (noun) an unexpected but vivid recurrence of a past experience (especially a recurrence of the effects of an hallucinogenic drug taken much earlier) | - |
| flashboard | (noun) boarding place along the top of a dam to increase its height | Synonyms: flashboarding |
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| flashboarding | (noun) boarding place along the top of a dam to increase its height | Synonyms: flashboard |
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| flashbulb | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashgun, photoflash |
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| flashcard | (noun) a card with words or numbers or pictures that is flashed to a class by the teacher | Synonyms: flash card |
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| flasher | (noun) an electrical device that automatically turns a lamp on and off (as for an advertising display) | - |
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| (noun) a light that flashes on and off; used as a signal or to send messages | Synonyms: blinker |
| (noun) someone with a compulsive desire to expose the genitals | Synonyms: exhibitionist |
| flashflood | (noun) a sudden local flood of great volume and short duration | Synonyms: flash flood |
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| flashgun | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, photoflash |
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| flashily | (adverb) in a fancy colorful manner | Synonyms: flamboyantly, showily |
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| (adverb) in a meretricious manner | Synonyms: meretriciously |
| flashiness | (noun) tasteless showiness | Synonyms: brashness, garishness, gaudiness, glitz, loudness, meretriciousness, tawdriness |
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| flashing | (noun) sheet metal shaped and attached to a roof for strength and weatherproofing | - |
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| (noun) a short vivid experience | Synonyms: flash |
| flashlight | (noun) a small portable battery-powered electric lamp | Synonyms: torch |
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| flashover | (noun) an unintended electric discharge (as over or around an insulator) | - |
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| flashpoint | (noun) the lowest temperature at which the vapor of a combustible liquid can be ignited in air | Synonyms: flash point |
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| (noun) a place of political unrest and potential violence | Synonyms: hot spot, hotspot, trouble spot |
| (noun) point at which something is ready to blow up | Synonyms: flash point |
| flashy | (adjective) (used especially of clothes) marked by conspicuous display | Synonyms: gaudy, jazzy, showy, sporty |
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| (adjective) tastelessly showy | Synonyms: brassy, cheap, flash, garish, gaudy, gimcrack, loud, meretricious, tacky, tatty, tawdry, trashy |
| flask | (noun) bottle that has a narrow neck | - |
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| (noun) the quantity a flask will hold | Synonyms: flaskful |
| flaskful | (noun) the quantity a flask will hold | Synonyms: flask |
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