plankn.[OE. planke, OF. planque, planche, F. planche, fr. L. planca; cf. Gr. , , anything flat and broad. Cf. Planch.]1. A broad piece of sawed timber, differing from a board only in being thicker. See Board.()2. Fig.: That which supports or upholds, as a board does a swimmer.()His charity is a better plank than the faith of an intolerant and bitter-minded bigot. (Southey.)3. One of the separate articles in a declaration of the principles of a party or cause; as, a plank in the national platform.()Plank road, or Plank way, a road surface formed of planks. [U.S.] -- To walk the plank, to walk along a plank laid across the bulwark of a ship, until one overbalances it and falls into the sea; -- a method of disposing of captives practiced by pirates.()()v. t.1. To cover or lay with planks; as, to plank a floor or a ship.(Dryden.)2. To lay down, as on a plank or table; to stake or pay cash; as, to plank money in a wager.()3. To harden, as hat bodies, by felting.()4. (Wooden Manuf.) To splice together the ends of slivers of wool, for subsequent drawing.()Planked shad, shad split open, fastened to a plank, and roasted before a wood fire.()