(Britain) The practice of jumping into the sea or similar body of water from a cliff or other high point such that the jumper enters the water vertically straight, like a tombstone.

present participle of tombstone

plural of tombstone

A headstone marking a person's grave. / (mathematics) The symbol "∎" marking the end of a proof.

(UK, intransitive) To take part in tombstoning: to jump into the sea, etc. from a cliff or other high point so as to enter the water vertically straight.

(informal, Britain) A person who engages in the activity of tombstoning.

plural of tombstoner

simple past tense and past participle of tombstone

Having tombstones.

A city in southeastern Arizona.