The Collaborative International Dictionary of English v.0.48:
Blink \Blink\ (bl[i^][ng]k), v. i. [imp. & p. p. Blinked
(bl[i^][ng]kt); p. pr. & vb. n. Blinking.] [OE. blenken;
akin to dan. blinke, Sw. blinka, G. blinken to shine, glance,
wink, twinkle, D. blinken to shine; and prob. to D. blikken
to glance, twinkle, G. blicken to look, glance, AS.
bl[imac]can to shine, E. bleak. [root]98. See Bleak; cf.
1. To wink; to twinkle with, or as with, the eye.
One eye was blinking, and one leg was lame. --Pope
2. To see with the eyes half shut, or indistinctly and with
frequent winking, as a person with weak eyes.
Show me thy chink, to blink through with mine eyne.
3. To shine, esp. with intermittent light; to twinkle; to
flicker; to glimmer, as a lamp.
The dew was falling fast, the stars began to blink.
The sun blinked fair on pool and stream . --Sir W.
4. To turn slightly sour, as beer, mild, etc.