which is which Meaning in the Cambridge English Dictionary
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Meaning of “which is which” in the English Dictionary

"which is which" in British English

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which is which

used in ​expressions that ​relate to being ​able to ​see the ​difference between two very ​similar things or ​people: For the first few ​months the ​babieslooked so ​alike I couldn't tell which was which.
(Definition of which is which from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"which is which" in American English

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which is which

each ​person or thing ​separately: The ​twinslook so much ​alike I’m ​surprised anyone can ​tell which is which.
(Definition of which is which from the Cambridge Academic Content Dictionary © Cambridge University Press)
Translations of “which is which”
in Chinese (Simplified) 哪个是哪个(用于区分两个相似的人或物时)…
in Chinese (Traditional) 哪個是哪個(用於區分兩個相似的人或物時)…
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