whistle
A device designed to be placed in the mouth and blown, or driven by steam or some other mechanism, to make a whistling sound.
Other meanings
An act of whistling.
A shrill, high-pitched sound made by whistling.
Word history
From Old English "hwistle".
Where this comes from
This definition is adapted from “whistle” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.