1. Tweedle-dum - Noun
2. Tweedle-dum - Proper noun
Tweedle-dum
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.
Tweedle-dum (plural Tweedle-dums)
One of a pair (the other of the pair being Tweedle-dee) of nominally different (often: but practically identical) things.