The idiom "in the buff" originated in 17th century England, where "buff" referred to a yellowish-brown leather made from buffalo skin. Initially used to describe someone dressed in a buff-colored garment, the phrase evolved to signify complete nudity. It is believed to have undergone a playful transformation through wordplay. Nowadays, "in the buff" is an informal expression used to describe being completely naked, emphasizing the absence of clothing.

英語での「in the buff」の定義と意味

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