<p><strong>Verb (used with object):</strong></p><ul><li>to fill or close seams or crevices of (a tank, window, etc.) in order to make watertight, airtight, etc.</li><li>to make (a vessel) watertight by filling the seams between the planks with oakum or other material driven snug.</li><li>to fill or close (a seam, joint, etc.), as in a boat.</li><li>to drive the edges of (plating) together to prevent leakage.</li></ul><p><strong>Noun:</strong></p><ul><li>Also caulk·ing [] a material or substance used for caulking.</li></ul>