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plural SOS's or SOSes
The conventional Morse code call made by a ship in distress. quotations examples
"Look at wireless. Look at the S. O. S. call at sea. Is that not a benefit to mankind?"
1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019
Initialism of Secretary of State. examples
Initialism of special order sale. examples
(colloquial) Initialism of slip on show: a warning to a woman that the underwear she has on can be seen. examples
uncountable
(games) A children's game in which players take turns to place S's and O's on a grid, collecting points by creating an "SOS" sequence. examples
Initialism of shit on a shingle. examples
(Commonwealth, military, historical) Initialism of struck off strength or stricken off strength.