whistle

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whis·tle

(wis'ĕl),
1. A sound made by forcing air through a narrow opening such as pursed lips.
2. An instrument for producing a whistle.
[A.S. hwistle]

whistle

(hwĭs′ĕl)
1. A sound produced by pursing one's lips and blowing.
2. A tubular device driven by wind that produces a loud and usually shrill sound.
References in classic literature ?
When we have been prowling at midnight through the gloomy crevices they call streets, where no footfalls but ours were echoing, where only ourselves were abroad, and lights appeared only at long intervals and at a distance, and mysteriously disappeared again, and the houses at our elbows seemed to stretch upward farther than ever toward the heavens, the memory of a cave I used to know at home was always in my mind, with its lofty passages, its silence and solitude, its shrouding gloom, its sepulchral echoes, its flitting lights, and more than all, its sudden revelations of branching crevices and corridors where we least expected them.
At length, branching off from Solomon's Great Road, we came to the wide fosse surrounding the kraal, which is at least a mile round, and fenced with a strong palisade of piles formed of the trunks of trees.
In India, Vyasa is branching, strange, impenetrable as a pagoda.
The most wonderful thing was that it and a German airship five hundred yards below were threaded as it were on the lightning flash, which turned out of its path as if to take them, and, that out from the corners and projecting points of its huge wings everywhere, little branching thorn-trees of lightning were streaming.
I can see the perspiration on the shining forehead of the bookbinder as he looks up from some brilliant passage, to exchange a smile of triumph with me at having made out the meaning with the meagre facilities we had for the purpose; he had beautiful red pouting lips, and a stiff little branching mustache above them, that went to the making of his smile.
Afterward, when they had stopped for a moment to allow Tip to rest, they saw forty roads branching off from their feet in forty different directions; and soon these forty roads began whirling around like a mighty wheel, first in one direction and then in the other, completely bewildering their vision.