1967, American English, from Yiddish klots "clumsy person, blockhead," literally "block, lump," from Middle High German klotz "lump, ball." Compare German klotz "boor, clod," literally "wooden block" (see clot (n.)).
*kleu-
klezmer
klieg
Klondike
kludge
klutz
klutzy
kluxer
kn-
knack
knacker
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