Erosion
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The gradual eating away of the soil by the operation of currents or tides. Distinguished from submergence, which is the disappearance of the soil under the water and the formation of a navigable body over it.
Mulry v. Norton, 100 N. Y. 433, 3 N. E. 584, 53 Am. Rep. 206.