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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. 2 an 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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