keep one's hair on

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keep one's hair on

  1. (idiomatic, Britain, colloquial) To stay calm; to be patient.
    All right, all right, just keep your hair on, mate.
    • 1901, Louis Couperus, Alexander Teixeira de Mattos (translator), Small Souls,
      “Oh, nothing, nothing!”
      “Yes, there’s something. I mean to know!”
      Keep your hair on; it’s nothing.”
      “Out with it!” cried Addie, scarlet with rage.
      And he flew at Jaap’s throat.