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washboard

noun

    1. a board or frame with a ridged surface of metal, glass, etc., used for scrubbing dirt out of clothes or as a percussion instrument in a jug band
    2. the worn surface of a paved road resembling this
  1. baseboard
  2. Naut. a thin, broad plank fastened along the gunwale of a boat or on the sill of a lower deck port to keep out the sea and spray

See washboard in American Heritage Dictionary 4

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