Movable covers that can be lifted to open or close something, or the fold of skin that covers your eyes.
From Old English 'hlid' (covering, lid). The word has been used since at least 1200 AD to describe anything that closes or covers an opening.
Your eyelids are the fastest-moving muscles in your body—they can blink in just 100-150 milliseconds—and the word 'lid' has stayed virtually unchanged for over 800 years.
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