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siren

noun [C] (DEVICE)
 
 
/ˈsaɪə.rən/ US  /ˈsaɪr.ən/

Definition

C2 a device for making a loud warning noise: police sirens When the air raid siren went off people ran to their shelters.Emergency services in generalThreats and warnings
(Definition of siren noun (DEVICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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