Tombstoning

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.

For a surfboard to stand upright half-submerged in the water (like a tombstone, above) because the surfer is underwater with his or her legrope pulled tight. Often this indicates a surfer in difficulty, either held down by the power of a wave or unconscious and unable to get to the surface.

To replace (an object or data) with a tombstone marker.

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.

The process of (automatically) initiating software sleep mode on an app.

An unwanted effect in the manufacture of electronic circuit boards, in which a component stands up on end instead of lying flat.

In page layout, putting articles side by side so that the headlines are adjacent. The phenomenon is also referred to as bumping heads.