To produce a high-pitched sound by forcing air through a small opening, often using the lips. She whistled a cheerful tune as she walked down the street.
To make a sound resembling a whistle, often used to describe the sound of wind or steam. The wind whistled through the trees during the storm.
To signal or summon someone by making a whistling sound. He whistled to get the dog's attention.
To move quickly with a sound like a whistle. The train whistled past the station at high speed.