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English definition of “whistle”

whistle

noun [C]     /ˈwɪs.l̩/
B2 the sound made by someone or something whistling : From the bottom of the garden I recognized my father's tuneless whistle. It sounded like the whistle of an old-fashioned steam train . She listened to the whistle of the wind through the trees .Sounds made by humans with their mouthsSounds made by objects, movement or impact an object that you hold to your lips and blow through in order to make a loud , high sound : The referee blew his whistle for half-time .Wind instruments
(Definition of whistle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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