Definition of in a flash
- I'll be back in a flash.
- The idea came to me in a flash.
: rush, dash
: to break forth in or like a sudden flame or flare
: to appear suddenly
: a sudden burst of light
: a movement of a flag in signaling
: a sudden and often brilliant burst
: flashy, showy
: of, relating to, or characteristic of flashy people or things
: of, relating to, or characteristic of persons considered social outcasts
: by very brief exposure to an intense altering agent (such as heat or cold)
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