which is which

English

Phrase

which is which

1. (informal, especially as a question) Used to indicate multiple things are difficult to tell apart

References

• “which is which”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “which is which”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.