Etymology
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bloodshot (adj.)

also blood-shot, of the eye, "red and inflamed by swelling of blood vessels," 1550s, short for bloodshotten (c. 1500), from blood (n.) + old past participle of shoot (v.).

updated on June 12, 2017

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Definitions of bloodshot from WordNet

bloodshot (adj.)
(of an eye) reddened as a result of locally congested blood vessels; inflamed;
bloodshot eyes
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.