soughing, from sough (?)

a soft, low, murmuring, sighing, or rustling sound

Broken Cedar, pg. 181 PB

At first I just overlooked this word, but when I re-read the paragraph later, I had to look it up. Yet another word that does not make sense in any context. The root is a noun. Maybe the author's making poetic flourishes... or he's just trying to sound smart.
[Then again, my dictionary could have excluding some meanings... perhaps to make such a sound. Nonetheless, the word does not make sense in context. "...winds capable of soughing screws from the hinges of a man's mind." (6-15-05)]