The quick closing and opening of your eyes, usually done automatically without thinking about it.
From Old English blincian, related to turning away or flinching. The word originally meant to avoid looking or to turn away, and evolved to describe the quick eye movement itself.
Your eyes blink about 15,000 times a day, and you don't even notice—but the moment someone tells you to stop blinking, you become hyper-aware of every single blink! It's one of the few automatic things your brain does that you can suddenly control.
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