two characters in the book Through the Looking-Glass by Lewis Carroll. They are fat little men, who are both dressed in school uniform and look exactly like each other. Their names are often used to describe two people or groups who are almost exactly the same as each other, especially when they both seem to be bad:
• Some voters felt there was little real difference between the two party leaders - a case of choosing between Tweedledum and Tweedledee.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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