Source : Webster's Revised Unabridged Dictionary (1913)

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.