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An international signal used by a distressed ship or aircraft to request help.
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 signal by radio, Very light, etc from a ship or other vessel in need of immediate assistance
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||distress signal - an internationally recognized signal sent out by a ship or plane indicating that help is needed|
signal, signaling, sign - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"
SOS - an internationally recognized distress signal in radio code
Mayday - an internationally recognized distress signal via radiotelephone (from the French m'aider)
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