Definitions
1.nounAn emergency maneuver by a submarine in which it suddenly descends, especially to considerable depth, usually in order to escape an attack or to avoid a collision.
2.nounA rapid descent by a person or thing ending in a violent collision.
3.verb(often hyphenated, submarine operation) To perform a crash dive.
4.verb(often hyphenated, submarine operation) To cause (a submarine) to perform a crash dive.
5.verb(often hyphenated) To rapidly descend, intentionally or accidentally, in a manner that ends in a violent collision.
6.verb(often hyphenated) To rapidly descend, in a manner that ends in a violent collision with (something).
7.verb(often hyphenated) To cause (something) to descend rapidly, in a manner that ends in a violent collision.