A void; an emptiness: a hollow in a single's life.
a tiny area between mountains.
a little valley between hills; "he built himself a cabin in a hollow high up within the Rockies"
A sunken area in something solid.
A sunken location, the same to a copse in British English.
a sense of emptiness.
A cavity, all-natural or synthetic; an unfilled room within anything; a hole, a cavern; an excavation; whilst the hollow of hand or of a tree.
the lowest spot surrounded by elevations; a depressed part of a surface; a concavity; a channel.
A cavity; a depression or an excavation underneath the general level, by the bottom, or perhaps in the material of any such thing; a clear room in such a thing; a concavity.
especially, a concave space of surface; an item or area of land less than the general degree, or hemmed in by mountains: used in many place-names in the us: as, Sleepy Hollow in nyc.
A concave jet utilized in working moldings.
A strip of thick report or of pasteboard slice toward exact level and depth required for a book that the boards and fabric are intended, and which acts as a gage for the assistance regarding the case-makers, and also as a stiffener for fabric at the rear of the book amongst the boards.