one and the same Definition in British English Dictionary
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Definition of "one and the same" - British English Dictionary

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one and the same

the same thing or person: I was amazed to discover that Mary's husband and Jane's son are one and the same (person).
Translations of “one and the same”
in Chinese (Traditional) 同一個事物, 同一個人…
in Chinese (Simplified) 同一个事物, 同一个人…
(Definition of one and the same from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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