The act of exploring caves as a sport or hobby; also means giving in or collapsing inward.
From 'cave', Old English 'cafu' from Latin 'cava' (hollow). The word originally meant a hollow place in the earth, and 'caving' as a sport developed in the 20th century.
Cave exploration reveals that 'cave' comes from Latin 'cavus' (hollow)—the same root gives us 'cavity,' 'excavate,' and even 'concave,' all describing hollow or inward-curving spaces!
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