cork

(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. Synonyms: phellem.

(noun) a port city in southern Ireland. Synonyms: Cork.

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

(noun) a small float usually made of cork; attached to a fishing line. Synonyms: bob, bobber, bobfloat.

(verb) close a bottle with a cork. Synonyms: cork up.

(verb) stuff with cork. Example: "The baseball player stuffed his bat with cork to make it lighter."