Definition of SOS in English:

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SOS

Pronunciation: /ˌesōˈes/

noun (plural SOSs)

1An international code signal of extreme distress, used especially by ships at sea.
1.1An urgent appeal for help.
1.2British A message broadcast to an untraceable person in an emergency: here is an SOS message for Mr. Arthur Brown about his brother, who is dangerously ill

Origin

Early 20th century: letters chosen as being easily transmitted and recognized in Morse code; by folk etymology an abbreviation of save our souls.

For editors and proofreaders

Syllabification: SOS

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