cork
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cork
A light, elastic material obtained from the bark of the cork oak. It is used for bottle stoppers, pinboards, flooring, and insulation.
Der Boden in meinem Zimmer ist aus Kork, weil er warm und leise ist.
The floor in my room is made of cork because it is warm and quiet.
'Kork' (cork) as a material is uncountable and is often used with 'aus Kork' (made of cork). When a single bottle stopper is meant, the word is countable and has the plural 'die Korke' (the corks).
Der neue Bodenbelag besteht aus Kork.
The new flooring is made of cork.
As a material, 'Kork' (cork) is often used in combinations that describe its application or properties. Typical phrases are 'Bodenbelag aus Kork' (flooring made of cork), 'Pinnwand aus Kork' (pinboard made of cork), or 'Isolierung aus Kork' (insulation made of cork).
Eine Pinnwand aus Kork ist sehr praktisch für Notizen.
A cork pinboard is very practical for notes.
When 'der Kork' (the cork) means a bottle stopper, it is often used with verbs such as '(heraus)ziehen' (to pull out), 'entfernen' (to remove), or 'stecken' (to be stuck/to sit).
Er zog den Kork mit einem lauten Plopp aus der Flasche.
He pulled the cork out of the bottle with a loud pop.
The idiom 'die Korken knallen lassen' (to pop the corks) means to celebrate exuberantly. The expression is used as a whole, and the verb 'lassen' (to let/have) is conjugated.
Nachdem sie die Prüfung bestanden hatte, wollte sie am Abend richtig die Korken knallen lassen.
After she had passed the exam, she wanted to really pop the corks that evening.
closure / fastener
'der Verschluss' and 'der Kork' can both have to do with closing a bottle. 'Verschluss' is the general term for a part that closes or secures something. 'Kork' first refers to a material from the bark of the cork oak. But it can also refer to a bottle stopper made of this material, similar to 'Korken'. That is why the words can be confused. If the function is important, you say 'Verschluss'. If it is about the material or the stopper of a bottle, 'Kork' fits.
Der Kork in dieser Weinflasche ist beim Öffnen zerbrochen.
The cork in this wine bottle broke when it was opened.
Bitte prüf den Verschluss der Flasche, bevor du sie in die Tasche legst.
Please check the closure of the bottle before you put it in the bag.