| 1. | the hollow, lowermost portion of a ship, floating partially submerged and supporting the remainder of the ship. |
| 2. | Aeronautics.
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| 3. | to pierce (the hull of a ship), esp. below the water line. |
| 4. | to drift without power or sails. |
| 5. | hull down, (of a ship) sufficiently far away, or below the horizon, that the hull is invisible. |
| 6. | hull up, (of a ship) sufficiently near, or above the horizon, that the hull is visible. |