Etymology
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hollow (adj.)

c. 1200, adjective developed from Old English holh (n.) "hollow place, hole," from Proto-Germanic *hul-, from PIE root *kel- (1) "to cover, conceal, save." The figurative sense of "insincere" is attested from 1520s. Related: Hollowly. Spelling development followed that of fallow, sallow. Adverbial use in carry it hollow "take it completely" is first recorded 1660s, of unknown origin or connection. Hollow-eyed "having deep, sunken eyes" is attested from 1520s.

hollow (v.)

late 14c., "to make hollow," holowen, from hollow (adj.). Related: Hollowed; hollowing. Old English had holian "to hollow out."

hollow (n.)

"lowland, valley, basin," 1550s, probably a modern formation from hollow (adj.), which is from Old English holh (n.) "cave, den; internal cavity."

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Definitions of hollow
1
hollow (adj.)
not solid; having a space or gap or cavity;
hollow cheeks
his face became gaunter and more hollow with each year
a hollow tree
a hollow wall
hollow (adj.)
as if echoing in a hollow space;
the hollow sound of footsteps in the empty ballroom
hollow (adj.)
devoid of significance or force;
a hollow victory
Synonyms: empty / vacuous
hollow (adj.)
lacking in substance or character;
a hollow person
2
hollow (n.)
a cavity or space in something;
hunger had caused the hollows in their cheeks
hollow (n.)
a small valley between mountains;
he built himself a cabin in a hollow high up in the Appalachians
Synonyms: holler
hollow (n.)
a depression hollowed out of solid matter;
Synonyms: hole
3
hollow (v.)
remove the inner part or the core of;
Synonyms: excavate / dig
hollow (v.)
remove the interior of;
hollow out a tree trunk
Synonyms: hollow out / core out
From wordnet.princeton.edu