which is which

idiom

used to say that one is unsure about the identity of each member of a group
One of the twins is named John and the other William, but I don't know which is which?

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Cite this Entry

“Which is which.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/which%20is%20which. Accessed 8 Feb. 2023.

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