密みっ書しょ

noun

secret message; confidential letter

Refers to a written message or document intended to be kept secret, often used in historical or espionage contexts.

• スパイは密みっ書しょを靴くつ底ぞこに隠かくした。

  The spy hid the secret message in the sole of his shoe.

• 彼かれは密みっ書しょを携たずさえて敵てき陣じんを抜ぬけ出だした。

  He escaped from the enemy camp carrying a confidential letter.