whistle Definition in Cambridge British English Dictionary
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Definition of "whistle" - British English Dictionary

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whistleverb

uk   us   /ˈwɪs.l̩/
B2 [I or T] to make a high sound by forcing air through a small hole or passage, especially through the lips, or through a special device held to the lips: He whistled as he worked. On the days when she wore a skirt the men on the building site would whistle at her. Someone was whistling Beatles tunes outside my window. The referee whistled and the game was over. [I + adv/prep] to make a long, high sound while moving quickly through or past something: She heard the wind whistling through the trees and the howl of a distant wolf. I stepped out of the building and immediately a bullet whistled past my head. [I] When birds whistle, they sing in high musical notes: The birds were whistling in the early morning quiet.
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whistlenoun [C]

uk   us   /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. 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.
(Definition of whistle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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