Whistle (noun) refers to a small wind instrument that produces sound when air is blown across a blade or mouthpiece, or a shrill sound made by forcing air through the lips. It can also denote a clear, sharp sound created by a person or object, such as a whistle blown in signaling or a whistle of wind. In everyday use, it often implies a sustained, piercing tone and can function as a device or act depending on context.
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