flash up

flash up

1. To flash very brightly and suddenly. The lightning had only just flashed up when the crack of the thunder boomed nearby. The car's headlights flashed up, signaling me that a speed trap was nearby.
2. Of a computer notification or message, to appear on the screen very suddenly. By the time the warnings began flashing up on our screens, the reactor had already begun to melt down. A little message flashed up in the bottom corner of my browser telling me that I had won $1 million.
See also: flash, up
Farlex Dictionary of Idioms.

flash something up (some place)

to shine a light upwards toward something. Flash your light up into the tree. She flashed up her light at the cat in the tree. Gloria flashed the light up.
See also: flash, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • flash through (one's) mind
  • flash through mind
  • flash into (one's) mind
  • flash into mind
  • flash across
  • flash across (something)
  • motion (someone) to the side
  • flash into view
  • flash off
  • go like lightning
References in periodicals archive
What that is doing is driving the volume of flash up which is driving the cost of flash down.
"The Indian customers like to take risk; they like new technology"
It hopes to phase out all the ads, which flash up and obscure the content on the screen, this year.
Microsoft in ban on 'pop' ads