cover / coverage
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cover
An object used to cover something in order to protect it, hide it, or close it off. This can be a tarp, a lid, or a panel.
Nach dem Grillen solltest du die Abdeckung wieder auf den Grill legen.
After grilling, you should put the cover back on the grill.
'Die Abdeckung' is the noun form of the verb 'abdecken' (to cover). The different meanings of the noun (covering something, covering a topic, hedging a risk) correspond directly to the uses of the verb.
Bitte deck die Gartenmöbel mit der Abdeckung ab.
Please cover the garden furniture with the cover.
The meaning is easy to work out from context. If it is about objects (pool, grill), it means physical protection. With media or mobile phone networks, it is about the extent of reporting or service availability. In finance, it is about hedging risks.
Die Abdeckung für das Cabriolet ist im Kofferraum.
The cover for the convertible is in the trunk.
In the literal sense, 'Abdeckung' is often used with verbs such as 'entfernen' (to remove), 'anbringen' (to attach), or 'auflegen' (to put on). People often talk about the 'Abdeckung' (cover) for a pool, a grill, or an electrical outlet.
Vor dem Winter müssen wir die Abdeckung auf den Pool legen.
Before winter, we have to put the cover on the pool.
In the figurative sense, you often find fixed word combinations such as 'mediale Abdeckung' (media coverage) or 'Netzabdeckung' (network coverage).
Die Netzabdeckung in den Bergen ist oft schlecht.
Network coverage in the mountains is often poor.
blanket / ceiling
'die Decke' and 'die Abdeckung' can both refer to something that lies on or over something else. However, 'Decke' often sounds more everyday and means, for example, a piece of fabric for keeping warm or a layer that covers something. 'Abdeckung' is used more when something is meant to be protected, hidden, or closed off, for example with a device, a car, or an opening. The words can be confused because both can cover something. A practical rule: a 'Decke' can keep you warm or lie there as a layer; an 'Abdeckung' usually has a clear protective or closing function.
Wegen des Regens bleibt die Abdeckung auf den Gartenmöbeln.
Because of the rain, the cover stays on the garden furniture.
Auf dem Sofa liegt eine weiche Decke für kalte Abende.
There is a soft blanket on the sofa for cold evenings.