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cave (n.)

"a hollow place in the earth, a natural cavity of considerable size and extending more or less horizontally," early 13c., from Old French cave "a cave, vault, cellar" (12c.), from Latin cavea "hollow" (place), noun use of neuter plural of adjective cavus "hollow," from PIE root *keue- "to swell," also "vault, hole." Replaced Old English eorðscrafu.

cave (v.)

early 15c., caven, "to hollow something out," from cave (n.). Modern sense "to collapse in or down" is 1707, American English, presumably from East Anglian dialectal calve "collapse, fall in and leave a hollow," which is perhaps from Flemish and subsequently was influenced by cave (n.). Transitive sense by 1762. Related: Caved; caving. Figurative sense of "yield to pressure" is from 1837.

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Definitions of cave from WordNet
1
cave (v.)
hollow out as if making a cave or opening;
Synonyms: undermine
cave (v.)
explore natural caves;
Synonyms: spelunk
2
cave (n.)
a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea;
From wordnet.princeton.edu