sough

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.

From Middle English sough (whence also Scots sheuch (“ditch”)), from Old English sōh, ultimately from Proto-West Germanic sīk (“watercourse”); compare dialectal Dutch zoeg (“ditch”), and English sitch.