Excavation at the base of a slope that results in the formation of an overhang.

The removal of material at the base of a steep slope or cliff by the erosive action of waves, running or seeping water, or windblown sand.

Where the river is flowing fast around an outside bend and erodes the bank to create a steep bank. The opposite of the slip-off slope.

an indentation eroded by waves at the base of a cliff which may hasten cliff collapse

The removal of material at the base of a steep slope or cliff or other exposed rock by the erosive action of waves, running water, or sand-laden wind.