flash , v :
To briefly illuminate a scene.
To blink; to shine or illuminate intermittently.
To be visible briefly. […]
(transitive, intransitive, informal) To briefly, and in most cases inadvertently, expose one’s naked body or underwear, or part of it, in public. (Contrast streak.)
(figuratively) To break forth like a sudden flood of light; to show a momentary brilliance.
To flaunt; to display in a showy manner.
To communicate quickly.
To move, or cause to move, suddenly.
(transitive) To telephone a person, only allowing the phone to ring once, in order to request a call back. […] The DC Comics title Justice League of America made its debut this month in 1960.