(or jibe in American) To turn a boat so that the wind changes from one quarter to the other across her stern, so swinging the mainsail over abruptly. This manoeuvre is called a gybe. A Gybing course is one where the boat is run¬ning before the wind with a chance that the wind will get behind the mainsail and swing it across. In a cabin boat a deliberate gybe is made by hauling in the main sheet until the sail is almost fore and aft so that it cannot gain much momentum in its short swing across. Once the wind is on the new side of the sail the sheet can be eased. Light dinghies, by contrast, often Gybe all standing, allowing boom and sail to sweep right across from square out on the one side to square out on the other. The greater mass and inertia of gear aboard a cruising boat makes the gybe all standing a risky business. (See Wear, to.)