blue (Noun) — Blue colour or pigment; resembling the colour of the clear sky in the daytime. ex. "he had eyes of bright blue"
blue (Noun) — Blue clothing. ex. "she was wearing blue"
blue (Noun) — Any organization or party whose uniforms or badges are blue. ex. "the Union army was a vast blue"
blue (Noun) — The sky as viewed during daylight. ex. "he shot an arrow into the blue"
blue (Noun) — Used to whiten laundry, hair or give it a bluish tinge.
blue (Noun) — The sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic.
blue (Noun) — Any of numerous small butterflies of the family Lycaenidae.
blue (Noun) — An angry dispute.
blue (Noun) — Someone who has red hair.
blue (Noun) — An embarrassing mistake.
blue (Adjective) — Of the colour intermediate between green and violet; having a colour similar to that of a clear unclouded sky. ex. "October's bright blue weather" ex. "a blue flame" ex. "blue haze of tobacco smoke"
blue (Adjective) — Used to signify the Union forces in the American Civil War (who wore blue uniforms). ex. "a ragged blue line"
blue (Adjective) — Filled with melancholy and despondency. ex. "lonely and blue in a strange city"
blue (Adjective) — Characterized by profanity or cursing. ex. "blue language"
blue (Adjective) — Suggestive of sexual impropriety. ex. "a blue movie" ex. "blue jokes"
blue (Adjective) — Belonging to or characteristic of the nobility or aristocracy. ex. "a blue family" ex. "blue blood" ex. "the blue-blooded aristocracy"
blue (Adjective) — Morally rigorous and strict. ex. "blue distaste for alcohol"
blue (Adjective) — Causing dejection. ex. "a blue day"
blue (Adjective) — Believing in or supporting tenets of the political right.
blue (Verb) — Turn blue.