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whistle (object)
post #1213133 post #1089577 post #506529
An instrument which produces sound from a stream of gas, most commonly air. It may be mouth-operated, or powered by air pressure, steam, or other means. Whistles vary in size from a small slide whistle or nose flute type to a large multi-piped church organ.
On this site, it's mostly used by coaches, lifeguards and referees.
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