Large natural underground chambers or hollow spaces in rock, often formed by water; or the verb meaning to collapse inward.
From Latin 'cavea' (hollow space or cage), derived from 'cavus' (hollow). The word entered English through Old French and maintained its sense of large hollow spaces in the earth.
Caves have been human homes, art galleries, temples, and treasure vaults—they're literally where human civilization began, and you can still find 40,000-year-old handprints on cave walls proving we're hardwired to mark our spaces.
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