In book collecting, a condition of the covers or boards of a hardcover book when they've turned inward toward the leaves or outward away from the leaves. It is usually the result of a rapid change in the level of moisture in the air and is caused by different rates of expansion or contraction of the pastedown and the outer material covering the board.
In book collecting, a condition of the covers or boards of a hardcover book when they've turned inward toward the leaves or outward away from the leaves. It is usually the result of a rapid change in the level of moisture in the air and is caused by different rates of expansion or contraction of the pastedown and the outer material covering the board.