casing

[ˈkeɪsɪŋ]
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case

An object's casing is its outer cover or protective layer.

When we talk about a casing, we usually think about something like a phone or a computer that has a hard plastic or metal covering around it. This covering protects the device from getting damaged and also helps to make it look neat and tidy. It's kind of like wrapping a fragile vase in bubble wrap – you're putting a layer of protection between the thing inside (the vase) and the outside world.

How common is "casing"?

Word casing is considered rare in modern English.
It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions

verb

  • To propose hypothetical cases.

verb

  • To place (an item or items of manufacture) into a box, as in preparation for shipment.

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noun

  • That which encloses or encases.

    Example: Some people like to split the casing of a sausage before cooking so it doesn't burst.

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