1. A clumsy person.
2. A stupid person; a dolt.
[Yiddish klots, from Middle High German kloz, block, lump, from Old High German.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
slang US and Canadian a clumsy or stupid person
[from German Klotz dolt; compare clot]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a clumsy, awkward person.
2. a stupid or inept person; blockhead.
[1965–70, Amer.; < Yiddish klots literally, wooden beam < Middle High German kloc]
klutz′y, adj. klutz•i•er, klutz•i•est.
Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.