Source : Webster's Revised Unabridged Dictionary (1913)

Gyb \Gyb\ (j[i^]b), Gybe \Gybe\ (j[imac]b), n. (Naut.)
   See {Jib}. [Obs.]

Gybe \Gybe\ (j[imac]b), n. & v.
   See {Gibe}.

Gybe \Gybe\, v. t. & i. [imp. & p. p. {Gybed}; p. pr. & vb. n.
   {Gybing}.] [See {Jibe}.] (Naut.)
   To shift from one side of a vessel to the other; -- said of
   the boom of a fore-and-aft sail when the vessel is steered
   off the wind until the sail fills on the opposite side. [Also
   {jibe}.]

Source : WordNet®

gybe
     v : shift from one side of the ship to the other; "The sail
         jibbed wildly" [syn: {jibe}, {jib}, {change course}]