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A rapid dive made by a submarine, especially in an emergency.
(Nautical Terms) a sudden steep dive from the surface by a submarine
1. (Aeronautics) (usually of an aircraft) to descend steeply and rapidly, before hitting the ground
2. (Nautical Terms) (of a submarine) to dive steeply and suddenly from the surface
3. (Nautical Terms) to perform or cause to perform a crash dive
4. (Aeronautics) to perform or cause to perform a crash dive