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A rapid dive made by a submarine, especially in an emergency.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014