whistle - definition and synonyms

noun [countable] 

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  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.
      a piece of equipment that produces a high sound, used as a warning or a signal on a train or a boat, or in a place such as a factory
      a whistle blows:

      The whistle blew as the train prepared to leave.

  2. 2

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    the sound that someone makes when they force air through their mouth
    give/let out a whistle:

    Darren gave a low whistle.

    1. a.
      a sound made as a signal or a warning, especially on a boat or a train, or in a place such as a factory

      the ship’s shrill whistle

    2. 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.

    3. c.
      the high sound that some birds make

      the skylark’s piercing whistle

       Synonyms and related words