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whistle

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noun [countable] British English pronunciation: whistle /ˈwɪs(ə)l/ 
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singularwhistle
pluralwhistles
  1. 1
    a small metal or plastic object that you put in your mouth and blow to make a high sound
    blow a whistle:

    The referee blew the whistle for half-time.

    a whistle goes/sounds:

    The whistle went for full-time.

    1. a.
  2. 2
    Sound effect: whistle the sound that someone makes when they force air through their mouth

    Loud cheers and whistles greeted the team.

    give/let out a whistle:

    Darren gave a low whistle.

    1. b.
      the sound that you make by blowing through a whistle

      Play stopped when we heard the whistle.

      the final whistle (=used for showing that a game or competition has finished):

      He scored again just seconds before the final whistle.

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