(of the eyes) red because of dilated blood vessels.

1545–55; apocopated variant of blood-shotten. See blood, shotten Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bloodshot (ˈblʌdˌʃɒt)
(of an eye) inflamed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1550s, short for bloodshotten (c.1500), from blood + old pp. of shoot.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bloodshot blood·shot (blŭd'shŏt')
Red and inflamed as a result of locally congested blood vessels, as of the eyes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And whatever the cost in dollars, it always seems to remain exorbitant in
  bloodshot eyes and frazzled nerves.
Slurred speech, bloodshot eyes, lack of concentration.
His tiny bloodshot eyes looked up and down the alleyway.
He had thick bushy eyebrows, with little twinkling bloodshot eyes, surrounded
  by a thousand wrinkles.
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