SOS
WordNet
noun
(1) An internationally recognized distress signal in radio code
WiktionaryText
Etymology 1
From the letters represented by the signal, chosen as a sequence that is easy to recall and transmit (· · · — — — · · ·); it is not, as is commonly believed, an abbreviation for "save our souls", "save our ship" or any other phrase.
Noun
- The conventional Morse code call made by a ship in distress.
- The keel has been scuppered — send out an SOS.