Tweedledum and Tweedledee
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twee·dle·dum and twee·dle·dee(twēd′l-dŭm′ ən twēd′l-dē′)
Two people or two groups resembling each other so closely that they are practically indistinguishable.
[After Tweedledum and Tweedledee, , names of two proverbial rival fiddlers, of imitative origin.]
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.
Tweedledum and Tweedledee(ˌtwiːdəlˈdʌm; ˌtwiːdəlˈdiː)
any two persons or things that differ only slightly from each other; two of a kind
[C19: from the proverbial names of Handel and the musician Buononcini, who were supported by rival factions though it was thought by some that there was nothing to choose between them. The names were popularized by Lewis Carroll's use of them in Through the Looking Glass (1872)]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Twee•dle•dum and Twee•dle•dee(ˌtwid lˈdʌm ən ˌtwid lˈdi)
two persons or things nominally different but practically the same.
[1715–25; humorous coinage, appar. first applied as nicknames to Italian composer Giovanni Bononcini (1670–1747) and German. French. Handel, with reference to their musical rivalry]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.