blue Adjective Supportive of, run by, pertaining to, or dominated by a political party represented by the colour blue. (e.g. The Conservatives, the Democrats)
blue Adjective Of the higher-frequency region of the part of the electromagnetic spectrum which is relevant in the specific observation.
blue Adjective Extra rare; left very raw and cold.
blue Adjective Possessing a coat of fur that is a shade of gray
blue Noun The colour of the clear sky or the deep sea, between green and violet 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.
blue Noun A blue dye or pigment.
blue Noun Bluing.
blue Noun Blue clothing
blue Noun A blue uniform. See blues.
blue Noun The sky, literally or figuratively.
blue Noun The ocean; deep waters.
blue Noun Anything blue, especially to distinguish it from similar objects differing only in color.
blue Noun One of the colour balls used in snooker with a value of 5 points.
blue Noun A bluefish.
blue Noun An argument.
blue Noun A liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
blue Noun a type of firecracker
blue Verb To make or become blue.
blue Verb To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.