The noun hollow has 3 senses (first 3 from tagged texts)
1. (2) hollow -- (a cavity or space in something; "hunger had caused the hollows in their cheeks")
2. (1) hollow, holler -- (a small valley between mountains; "he built himself a cabin in a hollow high up in the Appalachians")
3. (1) hole, hollow -- (a depression hollowed out of solid matter)
Overview of verb hollow
The verb hollow has 2 senses (no senses from tagged texts)
1. excavate, dig, hollow -- (remove the inner part or the core of; "the mining company wants to excavate the hillside")
2. hollow, hollow out, core out -- (remove the interior of; "hollow out a tree trunk")
Overview of adj hollow
The adj hollow has 4 senses (first 4 from tagged texts)
1. (1) hollow -- (not solid; having a space or gap or cavity; "a hollow wall"; "a hollow tree"; "hollow cheeks"; "his face became gaunter and more hollow with each year")