Quick definitions from Wiktionary (one and the same)
▸ noun: (idiomatic) The same person or thing. Used to emphasize the identity or equivalence of two things.
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▸ noun: (idiomatic) The same person or thing. Used to emphasize the identity or equivalence of two things.
▸ Words similar to one and the same
▸ Usage examples for one and the same
▸ Idioms related to one and the same (New!)
▸ Words that often appear near one and the same
▸ Rhymes of one and the same
▸ Invented words related to one and the same