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of the eyes, winking or blinking
"to wink," 1822, from Medieval Latin nictitatus, past participle of nictitare, frequentative of Latin nictare "wink, blink," related to nicere "to beckon," from PIE root *kneigwh- "to lean on, to bend" (the eyelids together). Related: Nictitated; nictitating (1713). Earlier form was nictate (v.), 1690s, from Latin nictare.