to make a clear musical sound, a series of such sounds, or a high-pitched, warbling sound by the forcible expulsion of the breath through a small opening formed by contracting the lips, or through the teeth, with the aid of the tongue.
to make such a sound or series of sounds otherwise, as by blowing on some device.
to emit similar sounds from the mouth, as birds do.
(of a device) to produce a similar sound when actuated by steam or the like: This teakettle whistles when it boils.
to move, go, pass, etc., with a whistling or whizzing sound, as a bullet or the wind.