One of the mysteries of the English language finally explained.
A shade of blue comparable to that of a clear daytime sky; a light blue.
Of the colour of a clear daytime sky; = sky-coloured.
Mid 16th century; earliest use found in Thomas Cooper (c1517–1594), theologian and bishop of Winchester. From sky + colour.
sky colour/ˈskʌɪ ˌkʌlə/
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