1. a washing out of earth, gravel, etc., by water, as from an embankment or a roadway by heavy rain or by a flash flood.
  2. the hole, break, or erosion produced by such a washing out.
  3. Also wash-out. Aeronautics. a warp in an airfoil that gives a decrease in the angle of attack toward the tip.Compare washin.
  4. rainout.
  5. Informal. an utter failure.
  6. Informal. a person who has failed a course of training or study: air force washouts.

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