Meaning

noun a ball of yarn or cord or thread

noun evidence that helps to solve a problem

verb roll into a ball

originFrom Middle English clew, clewe, clowe, clue, clwe, clyw, clywe, from Old English clēowen, clīewen, clīowen, clīwen, clȳwe, clȳwen (“ball, sphere; skein”), from Proto-Germanic *kliuwiną, *klewô (“bale, ball, clump, mass”), from Proto-Indo-European *glew- (“to ball up, clump together; lump, swelling”). Akin to Old English clǣġ (“clay”). Doublet of knawel. Cognates Cognate with Cimbrian khnaul…

Etymology from Wiktionary, CC BY-SA 3.0