Definition of "Cork" :

noun: a small float usually made of cork; attached to a fishing line

noun: the plug in the mouth of a bottle (especially a wine bottle)

noun: a port city in southern Ireland

noun: outer bark of the cork oak; used for stoppers for bottles etc.

noun: (botany) outer tissue of bark; a protective layer of dead cells

verb: stuff with cork

"The baseball player stuffed his bat with cork to make it lighter."

verb: close a bottle with a cork