Blue in the face

What is Blue in the face?

Blue in the face definition and meaning on Dictionary terms:
the pure color of a clear sky; the primary color between green and violet in the visible spectrum, an effect of light with a wavelength between 450 and 500 nm.

something having a blue color: Place the blue next to the red.
a person who wears blue or is a member of a group characterized by some blue symbol: Tomorrow the blues will play the browns.
(often initial capital letter) a member of the Union army in the American Civil War or the army itself.Compare gray1(def 13).
blue ribbon(def 1).
any of several blue-winged butterflies of the family Lycaenidae.
Printing. blueline.
the blue, the sky. the sea. the remote distance: They’ve vanished into the blue somewhere.

adjective, blu