The sky, literally or figuratively.
A blue uniform. See blues.
One of the three color charges for quarks.
A bluefish.
A bluestocking.
A dog or cat with a slaty gray coat.
The ocean; deep waters.
One of the colour balls used in snooker, with a value of five points.
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.
Blue clothing.
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.
Any of several processes to protect metal against rust.
A member or supporter of the Conservative Party.
The far distance; a remote or distant place.
A liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
A member of law enforcement.
A type of firecracker.
A blue dye or pigment.
A member of a sports team that wears blue colours; (in the plural) a nickname for the team as a whole. See also blues.
Anything coloured blue, especially to distinguish it from similar objects differing only in color.
The colour of the clear sky or the deep sea, between green and purple in the visible spectrum, and one of the primary additive colours for transmitted light; the colour obtained by subtracting red and green from white light using magenta and cyan filters; or any colour resembling this.
A person who has received such sporting colours.
Any of the butterflies of the subfamily Polyommatinae in the family Lycaenidae, most of which have blue on their wings.
An argument or brawl.
Risqué; obscene; profane; pornographic.
Having a color charge of blue.
Supportive of, run by (a member of), pertaining to, or dominated by the Democratic Party.
Supportive of or related to the Conservative Party.
Supportive of or related to the Liberal Party.
Extra rare; left very raw and cold.
Having a coat of fur of a slaty gray shade.
Depressed, melancholic, sad.
Of the higher-frequency region of the part of the electromagnetic spectrum which is relevant in the specific observation.
Having blue as its color.
Having a bluish or purplish shade of the skin due to a lack of oxygen to the normally deep red blood cells.
Pale, without redness or glare; said of a flame.
To fight, brawl, or argue.
To make or become blue; to turn blue.
To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
To brighten by treating with blue (laundry aid).
The region of the uppermost atmosphere where temperature increases along with the altitude due to the absorption of solar ultraviolet radiation by ozone. The stratosphere extends from the tropopause (10–15 kilometers) to approximately 50 kilometers, where it is succeeded by the mesosphere.