(idiomatic) Instantaneously; very quickly; in almost no time.

(computing) A multimedia platform, most often used for adding animation and interactivity to webpages.

Quality of being flash.

simple past tense and past participle of flash back

simple past tense and past participle of flash over

(physics) The lowest temperature at which a liquid can form an ignitable mixture in air near the surface of the liquid. / (figuratively) A hotspot; a dangerous place of violent political unrest.

A group of people who rapidly assemble, perform an unusual and seemingly pointless act, and then quickly disperse.

Alternative form of flashcrowd / A large audience for a sporting event that is unexpected because of large numbers of game-day ticket sales rather than advance tickets. / A crowd that forms suddenly.

A transient occurrence with no long-term effect. / A career notable for early success not followed by significant accomplishment.

(computer hardware) A small electronic device used to store digital data, more portable and robust than a hard drive.