washout

noun

• 1 informal an event that is spoiled by constant or heavy rain: they feared their wedding was going to be a washout because of torrential rain
• a disappointing failure:the film was branded a colossal washout

• 2a breach in a road or railway track caused by flooding: chores like repairing washouts in the gravel access road
• Geology a channel cut into a sedimentary deposit by rushing water and filled with younger material.

• 3 Medicine the removal of material or a substance from the body or a part of it, especially by washing with a fluid.