1 A device from the days of sail for cleaning the fouling off a ship's bottom when it was not copper sheathed. It was formed by enclosing a number of birch twigs between two planks, binding them together securely. The tops of the twigs were then cut off to form a stiff broom. The hog was guided under the ship's bottom by a long staff attached to the hog and drawn upwards by two ropes, one at each end of the hog, which was held hard against the ship's side by the staff. This operation was usually conducted from one of the ship's boats and was an alternative to breaming. For hogging lines see collision mat.
2 When used as a verb, a ship is said to be hogged when its bow and stern have drooped. It is also used as an adjective: when a ship's bow and stern are poised over the trough either side of a wave, the ship is said to be subject to a hogging stress.