What is "tombstoning"

n. 1 (context British English) 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 2 (context electronics English) An unwanted effect in the manufacture of electronic circuit boards, in which a component stands up on end instead of lying flat 3 (context journalism English) In page layout, putting articles side by side so that the headlines are adjacent. The phenomenon is also referred to as ''bumping heads''. 4 (context Southern US English) In highway driving, a blockage in traffic caused by a semi-trailer truck attempting to pass another with insufficient acceleration. 5 (digital libraries) The practice of leaving a marker in a location where a digital record has been withdrawn, in order to signify that the record had previously existed. vb. (present participle of tombstone English)

Tombstoning is the act of jumping in a straight vertical posture into the sea or other body of water from a high jumping platform, such as a cliff. This posture of the body, resembling a tombstone, gives the activity its name. A safety advisory from the Government of the United Kingdom records that tombstoning has been taking place for "generations"; however, it is under increasing media and public scrutiny due to wider coverage of the risks involved.