Tweedledum and Tweedledee

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌtwiːdəlˈdʌm/, /ˌtwiːdəlˈdiː/

US:USA pronunciation: respellingUSA pronunciation: respelling(twēd′l dum ən twēd′l dē)

WordReference Random House Unabridged Dictionary of American English © 2020
Twee•dle•dum and Twee•dle•dee  (twēd′l dum ən twēd′l dē),USA pronunciation 
  • two persons or things nominally different but practically the same;
    a nearly identical pair.
    • 1715–25; humorous coinage, apparently first applied as nicknames to Giovanni Bononcini and Handel, with reference to their musical rivalry; see tweedle

    Collins Concise English Dictionary © HarperCollins Publishers::
    Tweedledum and Tweedledee /ˌtwiːdəlˈdʌm; ˌtwiːdəlˈdiː/ n
    1. any two persons or things that differ only slightly from each other; two of a kind
    Etymology: 19th Century: 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)

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