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blinker

[bling-ker] /ˈblɪŋ kər/
noun
1.
a device for flashing light signals.
2.
a light that flashes intermittently, especially one that serves as a traffic signal.
3.
either of two leather flaps on a bridle, to prevent a horse from seeing sideways; a blinder.
verb (used with object)
4.
to put blinkers on.
Origin
1630-1640
1630-40; blink + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blinkering

blinker

/ˈblɪŋkə/
noun
1.
a flashing light for sending messages, as a warning device, etc, such as a direction indicator on a road vehicle
2.
(often pl) a slang word for eye1
verb (transitive)
3.
to provide (a horse) with blinkers
4.
to obscure with or as if with blinkers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blinkering

blinker

n.

1630s, "one who blinks," agent noun from blink (v.). As a type of horse eye screen to keep the animal looking straight ahead, from 1789. Slang meaning "the eye" is from 1816. Meaning "intermittent flashing light" is from 1923.

Online Etymology Dictionary, © 2010 Douglas Harper
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17
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