The top edge of the hull of a nautical vessel, where it meets the deck.
A board fastened along a ship's gunwale to prevent splashing; a splashboard.
A stretch of ripples or bumps on a dirt or gravel road caused by interaction between traffic and road surface.
Such a board used as a simple percussion instrument.
A board with a corrugated surface against which laundry may be rubbed.
To play a washboard.
To move up and down or back and forth across the surface of a hive, possibly to lay down a layer of propolis and wax.
To produce a rippled texture on a surface.