(intransitive) To appear suddenly on a screen.

(chiefly telecommunications) A change made to a complex system with immediate effect, one made without a phase-in period. / (sports, basketball) A quick move from the weak side toward the ball.

A flashbang.

present participle of flash-fry

plural of flash test

(transitive, colloquial) To make an ostentatious show of; to show to everybody in a boastful manner.

(occupational health and safety) Test of the integrity of the electrical insulation of an appliance or other electrical equipment, by measurement of resistance when a high voltage is applied.

A bundle of banknotes used by undercover law enforcement to convince a criminal that they want to go ahead with an illegal transaction.

plural of flash roll

(retail, marketing) A package printed with a special discount offer on it. / (photography) A device attached to a camera to provide a flash.