Origin: 19th circa from Northern dialect, dialectal from Middle English swough from Old English swogan, to sound from uncertain or unknown; perhaps Indo-European base an unverified form (s)waĝh-: see echo
Origin: ME swowen, soghen < OE swogan, to sound
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intransitive verb soughed, sough·ing, soughs
Origin: Middle English swowen, soughen, from Old English swōgan.