1.a cavity or space in something;
hunger had caused the hollows in their cheeks
2.a small valley between mountains;
he built himself a cabin in a hollow high up in the Appalachians
3.a depression hollowed out of solid matter
4.not solid; having a space or gap or cavity;
a hollow wall
5.deliberately deceptive;
hollow (or false) promises
6.as if echoing in a hollow space;
the hollow sound of footsteps in the empty ballroom
7.devoid of significance or point;
empty promises
1.remove the inner part or the core of;
the mining company wants to excavate the hillsite
2.remove the interior of;
hollow out a tree trunk