Definition from macmillandictionary.com
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The referee blew the whistle for half-time.
The whistle went for full-time.
The whistle blew as the train prepared to leave.
Loud cheers and whistles greeted the team.
Darren gave a low whistle.
the ship’s shrill whistle
Play stopped when we heard the whistle.
He scored again just seconds before the final whistle.
the skylark’s piercing whistle