Whistling
来自Big Physics
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Old English (h)wistlian (verb), (h)wistle (noun), of Germanic origin; imitative and related to Swedish vissla ‘to whistle’.
wiktionary
From Middle English whistlynge, equivalent to whistle + -ing.
From Middle English whistlinge, whystlynge, equivalent to whistle + -ing.
etymonline
whistling (n.)
Old English hwistlung, verbal noun from hwistlian (see whistle (v.)).
