washout

Erosion of a relatively soft surface, such as a roadbed, by a sudden gush of water, as from a downpour or floods.

A channel produced by such erosion.

An event or action that fails, is canceled, or ends prematurely, often because of rainy weather.

One who fails to measure up to a standard, especially one who fails a course of training or study.

In geology, a channel, eroded in one stratum and subsequently filled with material of a different character, such as the channels of shale which meander through coal-seams, cutting out the coal.