1725, in the meaning defined above
English tweedle to chirp + dum (imitative of a low musical note) & dee (imitative of a high musical note)
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Tweedledum and Tweedledee
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“Tweedledum and Tweedledee.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Tweedledum%20and%20Tweedledee. Accessed 23 Jan. 2022.
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