1. the letters represented by the radio telegraphic signal (· · · – – – · · ·) used, especially by ships in distress, as an internationally recognized call for help.
2. any call for help: We sent out an SOS for more typists.
verb (used without object)
3. to send an SOS.
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Origin: 1905-10, from the Morse code alphabet, in which three dots (or short clicks) represents the letter S and three dashes (or long clicks) represents the letter O
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