Guttering

The gutter ensures that text doesn't disappear into the "fold" (the spine) of a bound document.

: Thicker books require deeper gutters (wider margins) because the bulk of the pages prevents the book from opening flat. GUTTERING

In publishing and design, the is the crucial extra space added to the inside margin of a layout to account for binding. 📖 The "Gutter" in Text & Publishing The gutter ensures that text doesn't disappear into

: Prevents text from being obscured or lost in the binding. GUTTERING

Gutter highlights how-to - Technical Support - Sublime Forum

Beyond physical books, the term is used in digital layouts to manage "white space."