blue

of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky

“October's bright blue weather”

used to whiten laundry or hair or give it a bluish tinge

characterized by profanity or cursing

“blue language”

any of numerous small butterflies of the family Lycaenidae

any organization or party whose uniforms or badges are blue

“the Union army was a vast blue”

blue clothing

“she was wearing blue”

turn blue

used to signify the Union forces in the American Civil War (who wore blue uniforms)

“a ragged blue line”

morally rigorous and strict

“blue laws”

blue color or pigment; resembling the color of the clear sky in the daytime

“he had eyes of bright blue”

causing dejection

“a blue day”

the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic