sos
[noun]
Synonyms: alarm, alert, tocsin

[TahlilGaran] English Synonym Dictionary ▲

SOS /ˌes əʊ ˈes $ -oʊ-/ noun [singular]
[Date: 1900-2000; Origin: S and O, letters chosen because they were easy to send by Morse code, but often understood as short for "save our souls"]

1. a signal or message that a ship or plane sends when it is in danger and needs help ⇒ mayday

2. an urgent message that someone is in trouble and needs help:
This is an SOS for a Mr. Tucker, whose mother is seriously ill.

[TahlilGaran] Dictionary of Contemporary English ▲

SOS
international code signal of distress, call for help
The sinking ship had been sending out an SOS signal but still nobody was able to come to their rescue.

[TahlilGaran] English Idioms Dictionary ▲

SOS
MAYDAY (logging abbreviation) 
Sack Of Stuff (polite form) 
Same Old Stuff (polite form) 
Sick of School 
Slop on a Shingle (chipped beef on toast; polite form) 
Son of Sam 
Stuck On Stupid 
Stuff On a Shingle (polite form)

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲

S.O.S.
Service of suit

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲