Meaning

noun an ethnic group speaking Flemish and living in northern and western Belgium

noun one of two official languages of Belgium; closely related to Dutch

adjective of or relating to Flanders or its people or language or culture

originThe noun is an ellipsis of Flemish coil, so called because the technique of coiling rope in this manner began with sailors from Flanders. The verb is from Flemish (“of or relating to Flanders”, adjective), from Flemish coil.

Etymology from Wiktionary, CC BY-SA 3.0