The brief closing and opening of the eyelids, or the very short moment in time that a blink lasts.
Compound of 'eye' and 'blink' (from Middle Dutch 'blinken'). The word can mean either the action itself or the unit of time—about 100-400 milliseconds.
We blink about 17,000 times a day without thinking, and our brain mysteriously ignores those visual blackouts—'eyeblink' became a unit for measuring time, as in 'in an eyeblink.'
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