The amount by which the two sides of a ship are brought in towards the centreline after reaching their maximum beam. It is the opposite of flare, in which the sides curve outwards. Wooden ships of the 15th–18th centuries, and particularly wooden warships, were built with a very pronounced tumble-home, making the width of the upper deck considerably less than that of the main and lower decks. Warships had to have the tumble-home to accommodate the main- and lower-deck guns, which were much larger than those mounted on the upper gun-deck and needed more space for the gun crews to work them. The older term, tumbling-home, had an even earlier one, housing-in.
Subjects: Maritime History.