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distress signal

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noun
a signal used, or designed to be used, by persons in peril, for the purpose of summoning aid, indicating their position, etc., as a radio code sign, aerial flare, flag hoist, or the like.Compare distress call (def. 1).
an indication, especially a nonverbal one, that assistance, cooperation, or the like, is needed: He correctly interpreted the host's upturned eyes as a distress signal and hastily changed the subject.
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Origin of distress signal

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use distress signal in a sentence

British Dictionary definitions for distress signal

distress signal

noun
a signal by radio, Very light, etc from a ship or other vessel in need of immediate assistance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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