Letters that make red-eye
d, e, r, y are letters that make 'red-eye'
1 possible definitions for 'red-eye'
Under this definition, red-eye is a verb and has the following properties:
'red-eye' can be a type of fly.
'red-eye' can be a category of air travel, aviation, air.
"The candidate red-eyed from California to the East Coast the night before the election to give a last stump speech"