A cork is seal for a bottle. Traditionally, corks were made out
of a type of aged wood. Nowadays, most corks are made out of
plastic, though wooden corks are still used for higher end wines.
The verb form of cork means to close or seal
something. The idiom, put a cork in it, means to stop
Cork is the buoyant, light brown substance obtained from the outer bark layer of the cork oak. It is used to seal bottles.