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distress signal
dis·tress sig·nal (plural dis·tress sig·nals)


noun 
Definition:
 
signal requesting help: a signal, e.g. a radio message or a flare, sent by a ship or aircraft in urgent need of assistance
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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