whistle

noun [C]

/ˈwɪs.l̩/

Definition

1. Definition

2. Practise

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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