The mouth and throat; so called as being the organs of whistling.
Verb
To make a shrill, high-pitched sound by forcing air through the mouth. To produce a whistling sound, restrictions to the flow of air are created using the teeth, tongue and lips.
To make a similar sound by forcing air through a musical instrument or a pipe etc.
To move in such a way as to create a whistling sound.
To send, signal, or call by a whistle.
Origin
From Middle English whistlen, from Old English hwistlan, hwistlian, from Proto-Germanic *hwistlōną ("to make a hissing sound"). Cognate with Icelandic hvísla, Russian свистеть.
Modern English dictionary
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