whistle
verbUK /ˈwɪs.əl/
US /ˈwɪs.əl/
To make a high sound by blowing air through your lips or a small tool.
She likes to whistle a happy tune while she walks.
OTHER MEANINGS
2. A small object you blow into to make a loud sound.
The referee blew his whistle to stop the game.
3. A high sound made by air or steam passing through something.
We heard the whistle of the train coming down the track.
4. To make a high sound by moving quickly through the air.
The wind whistled through the trees.