Etymology

one and the same

Today it means: The selfsame. Used to emphasize the identity or equivalence of two things. Full definition →

Latin unus et idem
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The story

  1. Latin · calque ofunus et idem
  2. English todayone and the same

Possibly a calque of Latin unus et idem.

Etymology from Wiktionary, CC BY-SA 4.0.