From Wiktionary, the free dictionary
Blue sky is sky blue.
sky blue (comparative more sky blue , superlative most sky blue )
Of a vibrant light blue colour, like that of the sky on a fine day.
Synonym: cerulean
1952 , Nikos Kazantzakis , chapter 1, in Carl Wildman, transl., Zorba the Greek , New York, N.Y.: Simon & Schuster , translation of Βίος και πολιτεία του Αλέξη Ζορμπά [Víos kai politeía tou Aléxi Zormpá ], →ISBN , page 3 :“Hi! Kostandi!” called out an old sailor in a sky-blue cloak. “How are things with you?”
Albanian: kaltër (sq)
Arabic: سَمَاوِيّ ( samāwiyy ) , أَسْمَانْجُونِيّ (ar) ( ʔasmānjūniyy ) ( rare )
Armenian: երկնագույն (hy) ( erknaguyn )
Azerbaijani: asmanrəng
Belarusian: блакі́тны ( blakítny )
Bulgarian: небе́сносин m ( nebésnosin )
Chinese:
Mandarin: 天藍色 / 天蓝色 (zh) ( tiānlánsè ) , 蔚藍 / 蔚蓝 (zh) ( wèilán )
Chukchi: йъыпэральын ( jʔəperalʔən )
Chuvash: сенкер ( senk̬er )
Czech: blankytná f
Danish: himmelblå , lyseblå
Erzya: менельсэнь ( meńeľseń )
Estonian: taevasinine
Faroese: fagurbláur m , himmalbláur m
Finnish: taivaansininen (fi) , vaaleansininen (fi)
French: bleu ciel (fr)
Gagauz: çakır
Georgian: ცისფერი ( cisperi )
German: himmelblau (de) , azurblau (de)
Greek: γαλάζιος (el) ( galázios )
Gujarati: વાદળી ( vādaḷī )
Hindi: आसमानी (hi) ( āsmānī )
Hopi: sakwa
Hungarian: égszínkék (hu)
Indonesian: biru langit (id)
Irish: spéirghorm
Italian: celeste (it)
Japanese: 空色の (ja) ( そらいろの, sorairo no )
Komi-Zyrian: кельыдлӧз ( keľydlöz ) , югыдлӧз ( jugydlöz )
Korean: 하늘색 (ko) ( haneulsaek )
Kyrgyz: көгүлтүр (ky) ( kögültür ) , көгүш (ky) ( kögüş )
Latin: caeruleus (la)
Luxembourgish: himmelblo , hellblo
Malagasy: herin-javona
Malay: biru langit (ms)
Manx: speyr-ghorrym
Maori: kikorangi (mi)
Mari:
Eastern Mari: канде ( kande )
Western Mari: кловой ( klovoj )
Norwegian: lyseblå (no)
Pashto: شين (ps) ( šín ) , اسماني (ps) ( asmâní )
Persian: آبی آسمانی ( âbi-ye âsmâni ) , آسمانگون ( âsmângun ) , آسمانرنگ ( âsmânrang )
Polish: błękitny (pl)
Portuguese: azul-celeste (pt)
Punjabi: ਅਸਮਾਨੀ (pa) ( asamānī )
Quechua: qhusi
Romanian: azur (ro) , albastru ca cerul
Russian: голубо́й (ru) ( golubój ) , небе́сно-голубо́й (ru) ( nebésno-golubój ) , лазу́рный (ru) ( lazúrnyj )
Serbo-Croatian: nebesko plavetnilo m , nebesko plava f
Spanish: celeste (es)
Swedish: himmelsblå (sv) , ljusblå (sv)
Tagalog: kulay-langit , bughaw-langit
Tatar: зәңгәр ( zäñgär )
Thai: ฟ้า (th) ( fáa )
Turkish: gök mavisi (tr)
Tuvan: ак-көк ( ak-kök )
Udmurt: чагыр ( ćagyr )
Urdu: آسمانی (ur) ( āsmānī )
Volapük: silablövik
Yakut: халлаан күөх ( qallaan küöq )
Zazaki: asmeni , azmeni
sky blue (countable and uncountable , plural sky blues )
A vibrant light blue colour, like that of the sky on a fine day.
sky blue:
( UK , slang , obsolete ) Milk excessively diluted with water , or from which the cream was too closely skimmed .
1800 , Robert Bloomfield, The Farmer's Boy :Hence, Suffolk dairy wives run mad for cream, And leave their milk with nothing but the name; Its name derision and reproach pursue, And strangers tell of three-times-skimm'd sky-blue .
(blues ) blue ; Alice blue , aqua , aquamarine , azure , baby blue , beryl , bice , bice blue , blue green , blue violet , blueberry , cadet blue , Cambridge blue , cerulean , cobalt blue , Copenhagen blue , cornflower , cornflower blue , cyan , dark blue , Dodger blue , duck-egg blue , eggshell blue , electric blue , gentian blue , ice blue , lapis lazuli , light blue , lovat , mazarine , midnight blue , navy , Nile blue , Oxford blue , peacock blue , petrol blue , powder blue , Prussian blue , robin's-egg blue , royal blue , sapphire , saxe blue , slate blue , sky blue , teal , turquoise , ultramarine , Wedgwood blue , zaffre (Category: en:Blues )
( diluted milk ) : 1873 , John Camden Hotten, The Slang Dictionary