be born yesterday

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born + yesterday


be born yesterday (past tense only)

  1. (idiomatic, informal) To be new, naive, innocent, inexperienced, or easily deceived.
    I was not born yesterday, you know. I have done this before!
    • 2005, Howard Zinn and Donaldo Pereira Macedo, Howard Zinn on Democratic Education‎, page 69:
      If you don't know important things about history, then it's as if you were born yesterday.
    • 1998, Gwyn Hyman Rubio, Icy Sparks‎, page 155:
      "Compared to me, you were born yesterday."

Usage notes[edit]



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