red-eye 
noun
1 [mass noun] The undesirable effect in flash photography of people appearing to have red eyes, caused by a reflection from the retina when the flashgun is too near the camera lens: a pre-flash emission to minimize red-eye...
- Techniques are given such as boosting reds and yellows to produce an effect like a warming filter on a camera or removing red-eye found in flash photos.
- The effect is accentuated by the fact that everyone, including myself, is suffering from red-eye due to the camera flash.
- Throw this technique into your bag of GIMP tricks, and you'll never again have to worry about red-eye ruining your candid flash photos.
1.1 (also red-eye flight) [in singular] informal, chiefly North American A flight on which a passenger cannot expect to get much sleep on account of the time of departure or arrival: she caught the red-eye back to New York...
- I then spent six hours in the airport, took a red-eye flight back to Logan International, and crashed into bed at 7: 30 the next morning.
- She's catching a red-eye flight to Canada where she's making a movie with Alan Alda.
- I took a red-eye flight, did it for free, never thought twice.
2A freshwater fish with red eyes, in particular:
2.1British A rudd.
2.2North American A rock bass.
3 [mass noun] US informal Cheap whisky.Straight whiskey these days, though, is no shot of red-eye in a dirty glass....
- Whiskey is no longer just the drink of cigar-smoking older men in suits or a shot of red-eye in a dirty glass down at the local saloon.
3.1Canadian A drink made from tomato juice and beer.
