Definition of the blue
- They sailed off into the blue.
: of the color whose hue is that of the clear sky : of the color blue (see 2blue 1)
: discolored by or as if by bruising
: a color whose hue is that of the clear sky or that of the portion of the color spectrum lying between green and violet
: a pigment or dye that colors blue
: to make blue (see 1blue)
: to turn blue
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