a broad piece of sawed timber, differing from a board only in being thicker. see board.-fig.: that which supports or upholds, as a board does a swimmer.-one of the separate articles in a declaration of the principles of a party or cause; as, a plank in the national platform.-to cover or lay with planks; as, to plank a floor or a ship.-to lay down, as on a plank or table; to stake or pay cash; as, to plank money in a wager.-to harden, as hat bodies, by felting.-to splice together the ends of slivers of wool, for subsequent drawing.