<p><strong>noun</strong></p><ul><li>A washing out of earth, gravel, etc., by water, as from an embankment or a roadway by heavy rain or by a flash flood.</li><li>The hole, break, or erosion produced by such a washing out.</li><li>A warp in an airfoil that gives a decrease in the angle of attack toward the tip.</li><li>Informal: an utter failure.</li><li>Informal: a person who has failed a course of training or study: air force washouts.</li></ul>