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English definition of “SOS”

SOS

noun [S] uk   /ˌes.əʊˈes/ us    /-oʊˈ-/
a request for help, especially because of danger: Within an hour of the ship transmitting an SOS (message/call), six boats had arrived and started a rescue operation. The hospital sent out an SOS for extra blood supplies.Signs, signals and symbolsSpecific signs and symbolsEmergency services in general
(Definition of SOS from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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