sough
A murmuring sound; rushing, rustling, or whistling sound.
[...] Arthur; a fearful night it was: there was a sough in the air, a sound drawing nigh like that of a host marching:- — but you're looking pale and forwrought, man; is any thing ailing ye?
A gentle breeze; a waft; a breath.
A (deep) sigh.
A vague rumour.
obsolete
Where it comes from
From Middle English *sough, swough, swogh, from Middle English swoȝen, swowen, from Old English swōgan (“to make a sound; move with noise; rush; roar”), from Proto-West Germanic *swōgan, from Proto-Germanic *swōganą from Proto-Indo-European *sweh₂gʰ-, same source as English echo (via Ancient Greek). Cognate with Scots souch (“sough”), Icelandic súgur (“a rushing sound, rustle”). Noun replaced Middle English swei, sweȝ from Old English swēg. More at swoon.
Adapted from the Wiktionary entry sough (CC BY-SA 4.0).