Nouns

(n)whistle, whistlingthe sound made by something moving rapidly or by steam coming out of a small aperture
(n)whistle, whistlingthe act of signalling (e.g., summoning) by whistling or blowing a whistle“the whistle signalled the end of the game”
(n)whistlea small wind instrument that produces a whistling sound by blowing into it
(n)whistleacoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound
(n)pennywhistle, tin whistle, whistlean inexpensive fipple flute

Verbs

(v)whistlemake whistling sounds“He lay there, snoring and whistling”
(v)whistlemove with, or as with, a whistling sound“The bullets whistled past him”
(v)whistleutter or express by whistling“She whistled a melody”
(v)whistlemove, send, or bring as if by whistling“Her optimism whistled away these worries”
(v)whistle, singmake a whining, ringing, or whistling sound“the kettle was singing”, “the bullet sang past his ear”
(v)whistlegive a signal by whistling“She whistled for her maid”