1. the act of making a high-pitched sound by forcing air through pursed lips or teeth
2. a high-pitched sound made by air or steam passing through a small opening

1. making or characterized by a whistling sound

Examples

• The whistling of the wind kept me awake all night.
• His cheerful whistling could be heard down the hallway.
• The whistling kettle signaled that the water was ready.
• She heard the whistling of a train in the distance.
• The whistling sound from the radiator indicated a problem.
• A whistling noise came from under the car hood.