2. A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel. Forests grew upon the barren hollows. (Prior) I hate the dreadful hollow behind the little wood. (Tennyson)
1. Having an empty space or cavity, natural or artificial, within a solid substance; not solid; excavated in the interior; as, a hollow tree; a hollow sphere. Hollow with boards shalt thou make it. (ex. Xxvii. 8)
4. Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend. Hollow newel, a pier of stone or brick made behind the lock gates of a canal, and containing a hollow or recess to receive the ends of the gates. Hollow root.