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.
To shift, as the boom of a fore-and-aft sail, from one side of a vessel to the other when the wind is aft or on the quarter. See Gybe.
To change a ship's course so as to cause a shifting of the boom. See Jibe, v. t., and Gybe.