Source : Webster's Revised Unabridged Dictionary (1913)

Jib \Jib\, v. t. & i. [imp. & p. p. {Jibbed}; p. pr. & vb. n.
   {Jibbing}.] Also Jibb \Jibb\ [Cf. {Jib} a sail, {Gybe}.]
   (Chiefly Naut.)
   To shift, or swing round, as a sail, boom, yard, etc., as in
   tacking.