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Definition of SOS noun from the Oxford Advanced American Dictionary

     

    SOS

     noun
    noun
    NAmE//ˌɛs oʊ ˈɛs//
     
    [singular]
     
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  1. 1a signal or message that a ship or plane sends when it needs urgent help to send an SOS an SOS message
  2. 2an urgent request for help We've received an SOS from the area asking for food packages. see also Mayday
See the Oxford Advanced Learner's Dictionary entry: SOS

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