Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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throw up

The rising up or buckling of the spine of a book when it is opened. It is a characteristic of the HOLLOW BACK , and because of it the leaves lie flatter than they ordinarily would. "Throw up" is especially important in library binding, where the sewing, which is usually oversewing, is relatively tight and inflexible. See also:SPRING-BACK (1) .

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