Source : Webster's Revised Unabridged Dictionary (1913)

Sough \Sough\, v. i.
   To whistle or sigh, as the wind.

Sough \Sough\, n. [Etymol. uncertain.]
   A small drain; an adit. [Prov. Eng.] --W. M. Buchanan.

Sough \Sough\, n.
   A sow. [Obs.] --Chaucer.

Sough \Sough\ (?; 277), n. [Cf. Icel. s?gr (in comp.) a rushing
   sound, or OE. swough, swogh, a sound, AS. sw?gan to rustle.
   Cf. {Surf}, {Swoon}, v. i.]
   1. The sound produced by soughing; a hollow murmur or
      roaring.

            The whispering leaves or solemn sough of the forest.
                                                  --W. Howitt.

   2. Hence, a vague rumor or flying report. [Scot.]

   3. A cant or whining mode of speaking, especially in
      preaching or praying. [Scot.] --Jamieson.

Source : WordNet®

sough
     v 1: place (seeds) in or on the ground for future growth; "She
          sowed sunflower seeds" [syn: {sow}, {seed}]
     2: indicate pain, discomfort, or displeasure; "The students
        groaned when the professor got out the exam booklets";
        "The ancient door soughed when opened" [syn: {groan}, {moan}]
     3: introduce into an environment; "sow suspicion or beliefs"
        [syn: {sow}]