shut and open the eyes quickly

I blinked in astonishment

Lucy blinked at him, scarcely able to believe her ears

he blinked his eyes nervously

(of a light) flash on and off in a regular or intermittent way

the car's right-hand indicator was blinking

an act of shutting and opening the eyes very quickly

he was observing her every blink

a momentary gleam of light

out on the marshes there was a blink of light