Example: "His cheerful whistling indicated that he enjoyed his work"
Example: "The whistle signalled the end of the game"
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.
Example: "Never whistle at a funeral."
To make a similar sound by forcing air through a musical instrument or a pipe etc.
Example: "The stream train whistled as it passed by."
To move in such a way as to create a whistling sound.
Example: "A bullet whistled past."
To send, signal, or call by a whistle.