boat whistle

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Noun1.boat whistle - a whistle on a boat that is sounded as a warning
boat - a small vessel for travel on water
whistle - acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound
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References in periodicals archive ?
At sunset, Anous sets off his boat whistle, calling everyone back to the boat so that they can make the journey back to Tripoli.
Sounds included a boat whistle, owl hoots, and sonar pings.
The rural African scene in the Prologue contrasts with the "river boat whistle," an alien presence, in Act I (55).