noun

• (nautical, slang) A short sleep; a nap.
  "[…] & we went for a long walk & fatigued ourselves so that I, for one, took a caulk in the afternoon."

verb

• (nautical) To drive oakum into the seams of a ship's wooden deck or hull to make it watertight.
  "[W]e might be disturbed during the night by an order being given to "go about," and by hearing in the quiet hours of the morning the familiar inquiry of "How's her head?" Mine often ached with the din of the men caulking all day long!"
• (slang) To copulate.
• (nautical, slang) To take a short sleep; to nap.
  "There was the goggle-eyed daughter a blowing the Grampus [throwing a bucket of water upon a person] with the platter-faced planter, whenever he caulked upon deck; […]"