Hog

hog
To bend downward at the bow and stern for lack of longitudinal strength or rigidity. See also sag. (back)
hoist ...

HOG A scrub broom for scraping a ship's bottom under water. HOG FRAME A fore-and-aft frame, forming a truss for the main frames of a vessel to prevent bending.

The tendencies of the vessel to hog, or rise amidships, owing to the great weight fore and aft unsupported by the water, is corrected by a strong truss passing from stern to stern over crutches.

In an open boat it is often fastened to the keel and hog in such a way that it can be removed for maintenance.

Egyptian Galley 1600 B.C. The ship, clincher-built of cedar wand probably about 65 feet long, strength by a hog truss formed of wooden crotches supporting an immensely strong cable. This effectively prevented the hu ...

A boat with a "lot of sheer" is higher at the bow and stern than the center when viewed in profile; with little sheer, the sheer arc will be closer to a straight line (a hog sheer).