crash dives

Noun

crash dive (plural crash dives)

1. (idiomatic) An emergency maneuver by a submarine in which it suddenly descends, especially to considerable depth, usually in order to escape an attack or avoid a collision.
   • As the crash dive began at 1:50 p.m., the overboard ventilation valve had not been closed, which resulted in tons of water flooding the submarine.2000 March 19, Charles M. Cooke, “Letters: Loose Lips, Sinking Ships”, in Washington Post, retrieved 25 Oct 2015
2. A rapid descent by a person or thing, ending in a violent collision.
   • In "Icarus's Mother," a skywriter salutes two girls on a beach with the message, "E=MC²," and then swirls into a deadly crash dive.1985 October 4, Mel Gussow, “Theater: Three by Sam Shepard”, in New York Times, retrieved 25 Oct 2015
3. Three quarters of a front somersault, beginning on the feet and landing on the back.
   • The next routine can be the same as Routine 7 but with the crash dive being replaced with a one-and-three-quarter front somersault tucked (with a tariff of 0.7), making the total tariff 4.81990, Trampolining: The Skills of the Game

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