What is the meaning of plank?

noun

• A stout length of sawn timber; made in a wide variety of sizes and used for many purposes.
  • synonyms: board
• An endorsed policy in the platform of a political party.

verb

• Cover with planks.
  • usage: "The streets were planked"
  • synonyms: plank over
• Set (something or oneself) down with or as if with a noise.
  • usage: "He planked the money on the table"; "He planked himself into the sofa"
  • synonyms: flump, plonk, plop, plunk, plump down, plunk down, plump
• Cook and serve on a plank.
  • usage: "Planked vegetable"; "Planked shad"