1.
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"
2.
INFORMAL•NORTH AMERICAN
an overnight or late-night flight on a commercial airline."she caught the red-eye back to New York"
3.
a freshwater fish with red eyes, in particular a rock bass.
4.
INFORMAL•US
cheap whiskey.
5.
the name of this cache.