Wiktionary
screen-saver
n. (alternative spelling of screensaver English)
Usage examples of "screen-saver".
It can’t recognize your face, but it can tell whether or not a vaguely human-shaped form is sitting in front of it, and if that vaguely human-shaped form goes away, even for a fraction of a second, it will drop into a screen-saver that will blank the display and freeze the machine until such time as you type in a password, or biometrically verify your identity through voice recognition.
Tonight, as most nights, the place is oppressively silent except for torpid electronic bloops from the PCs (most editors favor the tropical aquarium screen-saver option, while the reporters go for intergalactic warfare motifs).