What is the meaning of Caulk?

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.

Alternative form of calk (pointed projection on a horseshoe)

A short sleep; a nap.

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.

To copulate.

To take a short sleep; to nap.

Source: wiktionary.org