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Definition of Tweedle-dum
1. Proper noun. A fictional little fat man who is the twin brother of Tweedle-dee and appears in multiple artistic works, including certain nursery rhymes and Lewis Carroll's ''Through the Looking-Glass''. ¹
2. Noun. One of a pair (the other of the pair being ''Tweedle-dee'') of nominally different (often: but practically identical) things. ¹
¹ Source: wiktionary.com