v. & n.
v. 1 a tr. close and open (one eye or both eyes) quickly. b intr. close and open an eye. 2 intr. (often foll. by at) wink one eye as a signal of friendship or greeting or to convey a message to a person. 3 intr. (of a light etc.) twinkle; shine or flash intermittently.
n. 1 the act or an instance of winking, esp. as a signal etc. 2 colloq. a brief moment of sleep (didn't sleep a wink). as easy as winking colloq. very easy. in a wink very quickly. wink at 1 purposely avoid seeing; pretend not to notice. 2 connive at (a wrongdoing etc.).
[ OE wincian f. Gmc: cf. WINCE(1), WINCH ]