What is the meaning of 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.

An act of whistling.

A shrill, high-pitched sound made by whistling.

Any high-pitched sound similar to the sound made by whistling.

A suit (from whistle and flute).

The mouth and throat; so called as being the organs of whistling.

To make a shrill, high-pitched sound by forcing air through the mouth. To produce a whistling sound, restrictions to the flow of air are created using the teeth, tongue and lips.

To make a similar sound by forcing air through a musical instrument or a pipe etc.

To move in such a way as to create a whistling sound.

To send, signal, or call by a whistle.

To request admission to Opus Dei, a Roman Catholic organization.

Source: wiktionary.org