sea-blue

The compound 'sea-blue' is a straightforward descriptive formation in English, combining two native Germanic elements. The first element, 'sea', originates from the Old English 'sǣ', a common Germanic term for a large body of salt water. The second element, 'blue', descends from Old English 'blāw', which referred to the color but also had associations with lividness or leaden hues. The compound logic is transparently metaphorical, using a familiar natural object—the sea—as a reference point to specify a particular shade within the spectrum of the color blue. This type of color naming is common across languages, anchoring abstract color perception in concrete, universally observed phenomena.

Structure: sea (body of water) + blue (color) sea: From Old English 'sǣ', of Germanic origin; related to Dutch 'zee' and German 'See'. Functions as a noun used attributively to modify the color. blue: From Old English 'blāw', of Germanic origin; related to Old Norse 'blár'. Functions as the head noun denoting the color.