Definition of red-eye noun from the Oxford Advanced American Dictionary

     

    red-eye

     noun
    noun
     
     
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  1. 1 (also red-eye flight) [countable] (informal) a flight in a plane at night, on which you cannot get enough sleep We took the red-eye to Boston.
  2. 2[uncountable] the appearance of having red eyes that people sometimes have in photographs taken using flash a flash mode that is designed to reduce the red-eye effect
See the Oxford Advanced Learner's Dictionary entry: red-eye