out of the blue

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1. The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer by radiant energy with wavelengths of approximately 420 to 490 nanometers; any of a group of colors that may vary in lightness and saturation, whose hue is that of a clear daytime sky; one of the additive or light primaries; one of the psychological primary hues.
a. A pigment or dye imparting this hue.
b. Bluing.
a. An object having this hue.
b. Dress or clothing of this hue: The ushers wore blue.
a. A person who wears a blue uniform.
b. blues A dress blue uniform, especially that of the US Army.
5. often Blue
a. A member of the Union Army in the Civil War.
b. The Union Army.
6. A bluefish.
7. Any of various small blue butterflies of the family Lycaenidae.
a. The sky.
b. The sea.
adj. blu·er, blu·est
1. Of the color blue.
2. Bluish or having parts that are blue or bluish, as the blue spruce and the blue whale.
3. Having a gray or purplish color, as from cold or contusion.
4. Wearing blue.
5. Being a trail, as for skiing, marked with a sign having a blue square, indicating an intermediate level of difficulty.
6. Relating to or being a blue state.
a. Gloomy; depressed. See Synonyms at depressed.
b. Dismal; dreary: a blue day.
8. Puritanical; strict.
9. Aristocratic; patrician.
10. Indecent; risqué: a blue joke; a blue movie.
tr. & intr.v. blued, blu·ing, blues
To make or become blue.
blue in the face
At the point of extreme exasperation: I argued with them until I was blue in the face.
into the blue
At a far distance; into the unknown: spontaneously take a trip into the blue.
out of the blue
1. From an unexpected or unforeseen source: criticism that came out of the blue.
2. At a completely unexpected time: a long-unseen friend who appeared out of the blue.

[Middle English blue, bleu, from Old French bleu, of Germanic origin; see bhel- in Indo-European roots.]

blue′ly adv.
blue′ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.out of the blue - not anticipatedout of the blue - not anticipated; "unanticipated and disconcerting lines of development"- H.W.Glidden; "unforeseen circumstances"; "a virtue unlooked-for in people so full of energy"; "like a bolt out of the blue"
unexpected - not expected or anticipated; "unexpected guests"; "unexpected news"
Adv.1.out of the blue - in a way that was not expectedout of the blue - in a way that was not expected; "her brother showed up at the wedding out of the blue"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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(bluː) adjective
1. of the colour of a cloudless sky. blue paint; Her eyes are blue.
2. sad or depressed. I'm feeling blue today.
1. the colour of a cloudless sky. That is a beautiful blue.
2. a blue paint, material etc. We'll have to get some more blue.
3. the sky or the sea. The balloon floated off into the blue.
ˈblueness noun
ˈbluish adjective
quite blue; close to blue. a bluish green.
ˈbluebottle noun
a kind of large house-fly with a blue abdomen.
ˈbluecollar adjective
(of workers) wearing overalls and working in factories etc. Blue collar workers are demanding the same pay as office staff.
ˈblueprint noun
a detailed photographic plan of work to be carried out. the blueprints for a new aircraft.
once in a blue moon
very seldom. He visits his mother once in a blue moon.
out of the blue
without warning. He arrived out of the blue, without phoning first.
the blues
low spirits; depression. He's got the blues today but he's usually cheerful.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.