Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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run in

The tendency of the sections of a book, particularly the sections at or near the center of a large book having considerable sewing swell, to collapse inward, causing the book to lose its shape, and (generally) to become loose in its case. Run in is usually caused by excessive swell in the spine, or by sewing that is too loose.

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