1 : of the color whose hue is that of the clear sky : of the color blue (see blue entry 2 sense 1) a blue jacket her bright blue eyes The house is blue with white shutters. 2 a : bluish the blue haze of tobacco smoke b : discolored by or as if by bruising blue with cold c : bluish gray a blue cat 3 a : low in spirits : melancholy
Starting with a really useful idiom, something that happens out of the blue is completely unexpected: Then one day, out of the blue, she announced she was leaving. Two very useful, less idiomatic, phrases with a similar meaning are all of a sudden and all at once. Both mean 'suddenly and unexpectedly': All of a sudden, she collapsed.
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out of the blue meaning
