What does the idiom "Take a leaf out of one's book" mean?

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mac, Historically, "leaf" has been used to refer to a single sheet of paper in a book. So while "page" might sound more modern to us, "leaf" preserves an older literary usage. (Detailed explanation here) : Botanical Connection: The term "leaf" was originally used for plant leaves, which were flat, thin, and often used as writing surfaces in ancient times (e.g., palm leaves in certain cultures). 2. Manuscript Transition: As books evolved, the flat, sheet-like nature of plant leaves became associated with the flat sheets of parchment, vellum, or paper used in manuscripts and books. This visual similarity likely led to the metaphorical use of "leaf" for "page." 3. Terminology in Bookmaking: In bookbinding and printing, a "leaf" refers to a single sheet of paper in a book, which has two sides: the recto (front) and the verso (back). This technical term became commonplace among scribes and printers. 4. Idiomatic Use: The idiom "take a leaf out of someone's book" first appeared in English around the 16th century. It metaphorically suggests copying a page (or action/idea) from someone else's "book of life" or experience. In summary, "leaf" gained its association with pages through its visual resemblance to plant leaves and became a standardized term in the language of books and manuscripts

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