washout

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Erosion of a relatively soft surface, such as a roadbed, by a sudden gush of water, as from a downpour or floods.
• noun A channel produced by such erosion.
• noun An event or action that fails, is canceled, or ends prematurely, often because of rainy weather.
• noun One who fails to measure up to a standard, especially one who fails a course of training or study.

from The Century Dictionary.

• noun 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.
• The excavation, by erosive action of water, of a part of a road-bed, the bank of a stream, a hillside, or the like; also, the hole or break resulting from such excavation.

from the GNU version of the Collaborative International Dictionary of English.

• noun The washing out or away of earth, etc., especially of a portion of the bed of a road or railroad by a fall of rain or a freshet; also, a place, especially in the bed of a road or railroad, where the earth has been washed away.
• noun a complete failure; -- of an enterprise.
• noun a person who has failed a course of study or training, leaving the program before its completion.
• verb to be removed by washing; -- of spots and stains, especially on clothing.
• verb to be removed, broken, or destroyed by the action of flowing water.
• verb to fail in a course of study or training, especially to leave before completion of the course.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An act of washing something out, or an appliance or device for doing so.
• noun biology, medicine The cleaning of matter from a physiological system using a fluid.
• noun meteorology The action whereby falling rainwater clean particles from the air.
• noun A channel produced by the erosion of a relatively soft surface by a sudden gush of water.
• noun colloquial A disappointment or total failure; an unsuccessful person.
• noun A sporting fixture that could not be completed because of rain.
• noun The aerodynamic effect of a small twist in the shape of an aircraft wing

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the erosive process of washing away soil or gravel by water (as from a roadway)
• noun the channel or break produced by erosion of relatively soft soil by water
• noun someone who is unsuccessful
• verb wash free from unwanted substances, such as dirt
• verb drain off the color in the course of laundering
• verb lose color in the process of being washed
• verb deplete of strength or vitality
• verb wear or destroy by the force of water
• verb remove by the application of water or other liquid and soap or some other cleaning agent
• verb prevent or interrupt due to rain