errorlight
nounUK /ˈerəlaɪt/
US /ˈerərlaɪt/
A small light that turns on to tell you something is wrong.
When the machine stopped working, the errorlight started blinking red.
OTHER MEANINGS
2. A glowing sign on a screen that shows a mistake has happened.
An errorlight appeared next to the password box.
3. A red lamp on a device that warns of a problem.
The errorlight on the printer flashed until we added paper.
4. A light used to point out faults during testing.
The engineer watched the errorlight to find the broken wire.