caulk /kɔːk/verb 4noun 3forms 3phrases 1 verb4 •To drive oakum into the seams of a ship's wooden deck or hull to make it watertight. •To apply caulking to joints, cracks, or a juncture of different materials. •(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; […] — 1829 •(slang) To copulate. noun3 •Caulking. •A composition of vehicle and pigment used at ambient temperatures for filling/sealing joints or junctures, that remains elastic for an extended period of time after application. •(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. — 1961 formscaulked · caulking · caulks Phrases with caulk caulk offTo go to sleep; to sleep instead of working.