Englishfor English speakers
casing
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noun
the outermost covering of a pneumatic tire
—
noun
the enclosing frame around a door or window opening
the casings had rotted away and had to be replaced
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noun
(= case)
the housing or outer covering of something
the clock has a walnut case
cover
Verb
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Something that is covering another thing is on top of (or over) the other thing in a way that stops people from seeing it.
I cover myself in two blankets at night to stay warm.
Remember to cover the pot with a lid while you're cooking something.
cover
Noun
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A cover is something that usually covers something else.
The cover of the book has a picture on it under the name of the book.