Jib (noun)

1. A triangular sail that is set at the bow of a sailing vessel, used to change the direction of the wind.
2. A spar projecting from the bow of a ship or boat, used to change the direction of the wind on the sails.

Origin:

From old english gieb, of unknown origin.

Examples:

1. The sailor hoisted the jib to change the direction of the wind.
2. The jib is used to help balance the mainsail on a sailboat.
3. The jib is the forward-most sail on a sloop-rigged boat.
4. The jib is controlled by a sheet, which is a rope used to change the angle of the sail to the wind.
5. A jib is useful in maneuvering into the wind, as it allows the boat to point closer to the wind than it would otherwise be able to.