blinken
to flash
A repeated, brief lighting up and going out of a light.
Die Warnleuchte am Armaturenbrett begann rot zu blinken.
The warning light on the dashboard began to flash red.

to flash / indicate
Loading your saved state.
to flash
A repeated, brief lighting up and going out of a light.
Die Warnleuchte am Armaturenbrett begann rot zu blinken.
The warning light on the dashboard began to flash red.

The verb 'blinken' (to flash) is used only for light sources, not for the movement of the eyes. When eyes quickly close and open, German uses a different verb.
Die Sterne blinkten am Nachthimmel.
The stars flashed in the night sky.
The exact meaning of 'blinken' (to flash / indicate) depends heavily on the context. In road traffic, it refers to the turn signal. With technical devices, it is a warning or status signal. In poetic language, it describes the shimmering of surfaces.
Bitte blinke, bevor du die Spur wechselst.
Please indicate before you change lanes.
In the context of driving, 'blinken' (to indicate) is very often combined with a direction. The most common phrases are 'rechts blinken' (to indicate right) and 'links blinken' (to indicate left).
Der Fahrer vor mir hat nicht geblinkt und ist einfach abgebogen.
The driver in front of me didn’t indicate and just turned.
In the meaning of 'schimmern' (to shimmer), 'blinken' (to gleam) is often connected with a light source or a reflective place. Typical formulations are 'in der Sonne blinken' (to gleam in the sun) or 'im Licht blinken' (to gleam in the light).
Der frisch gefallene Schnee blinkte in der Morgensonne.
The freshly fallen snow gleamed in the morning sun.
to report / display / advertise
'anzeigen' and 'blinken' can both communicate something, especially with technology or in traffic. 'anzeigen' is more general: a device, symbol, or screen makes information visible. 'blinken', on the other hand, describes a light that briefly turns on and off again and again. In a car, 'blinken' can also mean using the turn signal to indicate a direction. Learners may confuse the words because a flashing light often displays information. The key point is: 'anzeigen' refers to the information, while 'blinken' refers to the way the light behaves or to signaling while driving.

Vor der Kreuzung hat der Fahrer rechtzeitig geblinkt.
Before the intersection, the driver indicated in good time.
Am Bahnhof zeigt die Tafel die Verspätung des Zuges an.
At the train station, the board displays the train's delay.