SOS is the universal signal asking for help. Send an SOS, an SOS message, answer the SOS.
It stands for nothing: it was chosen in 1906 because three dots, three dashes and three dots is unmistakable in Morse, and the meanings people give it were invented afterwards. It is sent as one unbroken sequence rather than three letters.
1nounsosThe universal signal asking for help.
“The stranded sailors wrote SOS in huge letters on the sand.”
sos is a signal.
Practised in Emergency & Rescue