Definitions from Wiktionary (Blue)

▸ adjective:  Of a blue hue.
▸ adjective:  (informal) Depressed, melancholic, sad.
▸ adjective:  Having a bluish or purplish shade of the skin due to a lack of oxygen to the normally deep red blood cells.
▸ adjective:  Pale, without redness or glare; said of a flame.
▸ adjective:  (politics) Supportive of, run by (a member of), pertaining to, or dominated by a political party represented by the colour blue.
▸ adjective:  (US politics) Supportive of, run by (a member of), pertaining to, or dominated by the Democratic Party.
▸ adjective:  (Australian politics) Supportive of or related to the Liberal Party.
▸ adjective:  (UK politics) Supportive of or related to the Conservative Party.
▸ adjective:  (astronomy) Of the higher-frequency region of the part of the electromagnetic spectrum which is relevant in the specific observation.
▸ adjective:  (of steak) Extra rare; left very raw and cold.
▸ adjective:  (of a dog or cat) Having a coat of fur of a slaty gray shade.
▸ adjective:  (archaic) Severe or overly strict in morals; gloomy.
▸ adjective:  (archaic, of women) literary; bluestockinged.
▸ adjective:  (particle physics) Having a color charge of blue.
▸ adjective:  (informal) Risqué; obscene; profane; pornographic.
▸ adjective:  (slang, dated) Drunk.
▸ noun:  (countable and uncountable) The colour of the clear sky or the deep sea which is midway between green and cyan in the visible spectrum and one of the primary additive colours.
▸ noun:  Anything coloured blue, especially to distinguish it from similar objects differing only in color.
▸ noun:  A blue dye or pigment.
▸ noun:  (uncountable) Blue clothing.
▸ noun:  (in the plural) A blue uniform. See blues.
▸ noun:  A member of a sports team that wears blue colours; (in the plural) a nickname for the team as a whole. See also blues.
▸ noun:  (baseball, slang) An umpire, in reference to the typical dark blue color of the umpire's uniform. Sometimes perceived by umpires as derogatory when used by players or coaches while disputing a call.
▸ noun:  Sporting colours awarded by a university or other institution for sporting achievement, such as representing one's university, especially and originally at Oxford and Cambridge Universities in England. See also full blue, half blue.
▸ noun:  A person who has received such sporting colours.
▸ noun:  (slang) A member of law enforcement.
▸ noun:  (now historical) A bluestocking.
▸ noun:  The sky, literally or figuratively.
▸ noun:  The ocean; deep waters.
▸ noun:  The far distance; a remote or distant place.
▸ noun:  A dog or cat with a slaty gray coat.
▸ noun:  (snooker) One of the colour balls used in snooker, with a value of five points.
▸ noun:  (entomology) Any of the butterflies of the subfamily Polyommatinae in the family Lycaenidae, most of which have blue on their wings.
▸ noun:  A bluefish.
▸ noun:  (Australia, colloquial) An argument or brawl.
▸ noun:  A liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
▸ noun:  Any of several processes to protect metal against rust.
▸ noun:  (British) A type of firecracker.
▸ noun:  (particle physics) One of the three color charges for quarks.
▸ noun:  (UK politics) A member or supporter of the Conservative Party.
▸ noun:  A blue cheese.
▸ noun:  (slang, uncountable) Risqué or pornographic material.
▸ verb:  (ergative) To make or become blue; to turn blue.
▸ verb:  (transitive, metallurgy) To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
▸ verb:  (transitive, laundry) To brighten by treating with blue (laundry aid).
▸ verb:  (intransitive, Australia, slang) To fight, brawl, or argue.
▸ verb:  (transitive, slang, dated) To spend (money) extravagantly; to blow.
▸ noun:  A surname from German. An anglicization of German Blau.
▸ noun:  (rare) A female given name from English, typically used in conjoined names like Bonnie Blue or Blue Bell.
▸ noun:  A male nickname, occasionally used as a formal given name. (Australia) Nickname for a person with ginger hair.
▸ noun:  A letterman at Oxford or Cambridge.
▸ noun:  (historical) A member of the Royal Horse Guards (which merged with the 1st Dragoons in 1969)
▸ noun:  Synonym of British Blue (“a breed of cat”)
▸ Also see blue

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