closure / fastener
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fastener / closure
A device for closing or securing a container, an opening, or an item of clothing. Examples include lids, zippers, or buttons.
Der luftdichte Verschluss der Dose hält die Kekse frisch.
The airtight closure on the tin keeps the cookies fresh.
The noun 'der Verschluss' (closure/fastener) is derived directly from the verb 'verschließen' (to close, to lock). When you close something, you use a 'Verschluss' (closure/fastener) for it. This connection helps you remember both words.
Bitte verschließ die Flasche wieder fest.
Please close the bottle tightly again.
The expression 'etwas unter Verschluss halten' (to keep something under lock) is a fixed unit. It means to keep something secret or securely locked away so that no one has access.
Die Namen der Gewinner werden bis morgen unter Verschluss gehalten.
The names of the winners will be kept under lock until tomorrow.
In the context of photography, 'der Verschluss' (the shutter) refers to the mechanism in the camera that regulates light. The word is almost always used here in the compound 'die Verschlusszeit' (shutter speed).
Für Nachtaufnahmen brauchst du eine lange Verschlusszeit.
For night shots, you need a long shutter speed.
In medicine, 'der Verschluss' (occlusion/blockage) means the blockage of a hollow organ, usually a blood vessel. People then often speak of a 'Gefäßverschluss' (vascular occlusion) or 'Arterienverschluss' (arterial occlusion).
Ein Gefäßverschluss im Bein kann starke Schmerzen verursachen.
A vascular occlusion in the leg can cause severe pain.
'Verschluss' (fastener/closure) is the base word for many specific types of fasteners. Examples are 'der Reißverschluss' (zipper, on a jacket), 'der Schraubverschluss' (screw cap, on a bottle), or 'der Klettverschluss' (Velcro fastener, on shoes).
Der Reißverschluss an meiner Hose ist kaputt.
The zipper on my pants is broken.
castle / lock
'das Schloss' and 'der Verschluss' both have to do with closing or securing something. 'Schloss' is more specific when it refers to a lockable mechanism, usually with a key, for example on a door or a suitcase. 'Verschluss' is more general. It can be a lid, a zipper, a button, or another closing mechanism. Learners can confuse the words because a Schloss is also a kind of Verschluss. But not every Verschluss is a Schloss.
Der Verschluss der Flasche ist undicht, deshalb läuft Wasser in die Tasche.
The bottle's closure leaks, so water is running into the bag.
Wenn das Schloss kaputt ist, kann niemand die Tür abschließen.
If the lock is broken, no one can lock the door.