Whistle
/wˈɪsəl/
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Definition
(noun) A device designed to be placed in the mouth and blown, or driven by steam or some other mechanism, to make a whistling sound.
Sentence Examples
A whistle blew, and the boat slowly began to pull out of port.
We were roused at daybreak by the whistle of a train.
CEFR Practice Quiz
I heard the sudden sound of a ____ earlier this morning, which indicated that the train was about to leave the station today.