Usually 'the gutter'.

The gutter. A parking strip. Often referred to as a parkway in the New England area.

In a yearbook, the gutter refers to the center margin where two facing pages meet. It is the area that is often affected by binding and may have content such as important text or images avoid it to ensure they are not obscured when the book is bound.

A common solution to litter that is in a storm gutter and is clogging a sewer grate is to remove the litter by hand. A person may also use a rake or shovel to remove the trash.

In MS Word, As the Gutter Value is increased, Page Margin Will remain the same irrespective of gutter value, the gutter size will be affected.