American English

Definition of Tweedledum and Tweedledee noun from the Oxford Advanced American Dictionary

 

Tweedledum and Tweedledee

 noun
noun
NAmE//ˌtwidlˈdʌm ən ˌtwidlˈdi//
 
[plural]
 
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two people or things that are not different from each other From two characters in Through the Looking Glass by Lewis Carroll, who look the same and say the same things.
See the Oxford Advanced Learner's Dictionary entry: Tweedledum and Tweedledee