Definition of plank

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