Akademik

tumble home
I. intransitive verb
: to incline inward above the waterline or greatest breadth : fall home — compare batter III; used chiefly of the sides of a ship
II. noun
: a receding upward slope (as of a ship's sides) : an inclination inward from the greatest breadth

as in all ships of the period, her sides have considerable tumble home — H.G.Smith

the tumble home of a building toward the top

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1. Naut. an inward and upward slope of the middle body of a vessel.
2. Also, tumblehome. a similar shape for the body of an automobile.
[1825-35]

Useful english dictionary. 2012.