綴とじ代しろ

noun

binding margin; gutter; seam allowance

Refers to the extra space left along the edge of a page or fabric for binding or sewing. In bookbinding it is the gutter margin; in sewing it is the seam allowance.

• 印いん刷さつするときは、綴とじ代しろを十じゅう分ぶんに取とってください。

  When printing, please leave enough binding margin.

• この本ほんは綴とじ代しろが狭せまいので、コピーしにくい。

  This book has a narrow gutter, so it's hard to copy.