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SOS

noun
🔊/ˌes əʊ ˈes/
🔊/ˌes əʊ ˈes/
 [singular]
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  1. a signal or message that a ship or plane sends when it needs help immediately（船舶或飞机发出的）紧急呼救信号
    • to send an SOS发出紧急呼救信号
    • an SOS message紧急呼救信号
    Topics Transport by waterc2
  2. a serious request for immediate help紧急求助的请求
    • We've received an SOS from the area asking for food parcels.我们收到来自那一地区的紧急求援信息，他们急需食物包。🔊🔊
    see also Mayday
    3. Word Originearly 20th cent.: letters chosen as being easily transmitted and recognized in Morse code; by folk etymology an abbreviation of save our souls.