verb
the act of making a high-pitched sound by blowing air through pursed lips
adjective
describing the action of making a high-pitched sound
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The sound of whistling wind could be heard through the cracks in the window.
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I caught myself whistling along to the radio in the car.
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He was whistling at the cute girl who walked by.
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The kettle began whistling, signaling that it was time to make tea.