flash up

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
References in periodicals archive ?
What that is doing is driving the volume of flash up which is driving the cost of flash down.
It hopes to phase out all the ads, which flash up and obscure the content on the screen, this year.