Etymology
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klutz (n.)

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.)).

updated on March 21, 2016

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Definitions of klutz from WordNet

klutz (n.)
(Yiddish) a clumsy dolt;
From wordnet.princeton.edu, not affiliated with etymonline.