Definition:
Binder board is a type of thick cardboard that bookbinders use to create the covers for books. It is sturdy and provides protection to the pages inside.
In professional bookbinding, binder board can come in various thicknesses and finishes. It is essential for ensuring that the book covers are durable and aesthetically pleasing.
While there are no specific idioms or phrasal verbs directly related to "binder board," you might encounter phrases like "bind together," which means to unite or bring things together, similar to how a binder holds papers or a book cover holds the pages.
Remember that "binder board" is mainly used in the context of bookbinding and refers to a sturdy material for making book covers.