The object used to plug the end of a bore. Usually this object is a rubber bung. An actual cork is not suitable for an airtight seal. 2. . The action taken to plug the end of a bore. This definition is much more common than #4, but is sometimes confused with that definition. 3. . The material used as an alternative to hemp to seal the tenons when they are inserted into the bores. 4. . The action taken to apply the cork to the tenons.