Flash

1. To blink; to shine or illuminate intermittently. Flash your lights when you want to pass.
2. To briefly illuminate a scene. He flashed his light on the car.
3. A very short amount of time. It happened in a flash.
4. To make visible briefly. A number will be flashed on the screen.
5. To flaunt; to display in a showy manner. He flashed a big wad of hundred-dollar bills.
6. To communicate quickly. The news service flashed the news about the war's end.
7. A flashlight (UK an electric torch). We keep a flashlight handy in case of a power failure.
8. Occurring very rapidly, almost instantaneously. It was over in a flash.