/ ˌtwiːdlˈdʌm ən twiːdlˈdiː; NAmE / noun
[ pl. ] two people or things that are not different from each other
ORIGIN: From two characters in Through the Looking Glass by Lewis Carroll who look the same and say the same things.
For more information see the Cultural Guide
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WORD ORIGIN
originally names applied to the composers Bononcini (1670–1747) and Handel, in a 1725 satire by John Byrom (1692–1763); they were later used for two identical characters in Lewis Carroll's Through the Looking Glass .