Noun: tombstoning
- Jumping into the sea (or other body of water) from a cliff or other high point
"Local authorities campaigned against tombstoning due to its dangerous nature"
- Jump into the sea (or other body of water) from a cliff or other high point
"Despite warnings, thrill-seekers continued to tombstone off the coastal cliffs"
Encyclopedia: Tombstoning
Tombstone, the Town Too Tough to Die