Definitions from Wiktionary (Blue)

▸ adjective:  Of a blue hue.
▸ adjective:  (informal) Depressed, melancholic, sad.
▸ adjective:  Having a bluish or purplish shade to the skin due to a lack of oxygen to the normally deep-red red blood cells; cyanotic.
▸ adjective:  (of a flame) Pale, without redness or glare.
▸ 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, dominated by, or shifted toward the higher-frequency, or "bluer", end of the electromagnetic spectrum.
▸ adjective:  (particle physics) Having a colour charge of blue.
▸ 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; scholarly; bluestockinged.
▸ adjective:  (informal) Risqué; obscene; profane; pornographic.
▸ adjective:  (slang, dated) Drunk.
▸ noun:  (countable and uncountable) The colour of the clear sky or the deep sea; the colour midway between green and violet 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 colour.
▸ 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 colour 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 colour 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”)

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