Source : Webster's Revised Unabridged Dictionary (1913)

Yaw \Yaw\, n. (Naut.)
   A movement of a vessel by which she temporarily alters her
   course; a deviation from a straight course in steering.

Yaw \Yaw\, v. i. [imp. & p. p. {Yawed}; p. pr. & vb. n.
   {Yawing}.] [Cf. {Yew}, v. i.]
   To rise in blisters, breaking in white froth, as cane juice
   in the clarifiers in sugar works.

Yaw \Yaw\, v. i. & t. [Cf. Prov. G. gagen to rock, gageln to
   totter, shake, Norw. gaga to bend backward, Icel. gagr bent
   back, gaga to throw the neck back.] (Naut.)
   To steer wild, or out of the line of her course; to deviate
   from her course, as when struck by a heavy sea; -- said of a
   ship.

         Just as he would lay the ship's course, all yawing
         being out of the question.               --Lowell.

Source : WordNet®

yaw
     v 1: be wide open; "the deep gaping canyon" [syn: {gape}, {yawn}]
     2: deviate erratically from a set course; "the yawing motion of
        the ship"
     3: swerve off course momentarily; "the ship yawed when the huge
        waves hit it"

yaw
     n : an erratic deflection from an intended course [syn: {swerve}]