cork stopper; cork
Refers to a cork used to seal a bottle, especially a wine bottle. Can be the material object or the stopper itself.
ワインのコルク栓を抜く。
I pull the cork out of the wine bottle.
コルク栓
The cork is stuck and won't open.
Compound of コルク (cork, from Portuguese or Dutch) and 栓 (stopper, plug).