1. an unfilled space cavity, hole
in the hollow of a tree
2. a depressed or low part of a surface especially a small valley or basin
3. having an indentation or inward curve concave, sunken
hollow cheeks
4. having an unfilled or hollowed-out space within
a hollow tree
5. lacking in real value, sincerity, or substance false, meaningless
hollow promises a victory over a weakling is hollow and without triumph
— Ernest Beaglehole
6. reverberating like a sound made in or by beating on a large empty enclosure muffled
heard a hollow sound when he knocked on the wall
7. to remove the inside of to make hollow (see hollow entry 2)
a hollowed tree hollowing out pumpkins for Halloween
8. to form by removing the inside of something to form by making something hollow —usually used with out
rain barrels hollowed out from trees
— Robert Shaplenhollowing out a tunnel
9. to become hollow
his cheeks had hollowed
10. so as to have a hollow (see hollow entry 2 sense 4) sound
The sound echoed hollow in the cave. in a way that reflects a lack of real value, sincerity, or substance
Their threats rang hollow.
11. completely, thoroughly
an ongoing story that has the old cowboy-and-Indians genre beat hollow
— Barbara Bannon —often used with all
12. a place or area (especially on the ground) that is lower than the area around it
13. an empty space inside of something
14. having nothing inside not solid
15. curved inward or down
16. not having real value or meaning
17. to remove the inside of (something)
18. having a space inside not solid
a hollow chocolate egg
19. curved inward sunken
hollow cheeks
20. suggesting a sound made in an empty place
a hollow roar
21. not sincere
a hollow promise
22. a low spot in a surface
Circling around through the flats, I came to the hollow above the Pritchards' place.
— Wilson Rawls, Where the Red Fern Grows
23. a small valley
24. an empty space within something
Owls live in the hollow of the tree.
25. to make or become hollow
The canoe was made by hollowing out a log.
26. a depressed part of a surface or a concavity
the hollow at the back of the knee