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Definition of siren noun from the Oxford Advanced Learner's Dictionary

siren

noun
 
/ˈsaɪrən/
 
/ˈsaɪrən/
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  1. a device that makes a long loud sound as a signal or warning
    • an air-raid siren
    • A police car raced past with its siren wailing.
    Extra Examples
    • The cars had stopped at the sound of the approaching siren.
    • The ships all sounded their sirens.
    • the blaring sirens of ambulances and police cars
    Topics Law and justicec1
    Oxford Collocations Dictionaryadjective
    • approaching
    • distant
    • blaring
    verb + siren
    • put on
    • sound
    • switch on
    siren + verb
    • go
    • go off
    • sound
    See full entry
  2. (in ancient Greek stories) any of a group of sea creatures that were part woman and part bird, or part woman and part fish, whose beautiful singing made sailors sail towards them into rocks or dangerous waters
  3. a woman who is thought to be very attractive or beautiful but also dangerous
  4. siren voices/song/call (literary) a temptation to do something that seems very attractive but that will have bad results
    • The government must resist the siren voices calling for tax cuts.
  5. Word OriginMiddle English (denoting an imaginary type of snake): from Old French sirene, from late Latin Sirena, feminine of Latin Siren, from Greek Seirēn.
See siren in the Oxford Advanced American Dictionary
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