Englishfor English speakers
collection
Noun
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A collection is a group of things of the same type. They are usually special in some way.
He has one of the biggest collections of paintings by Van Gogh.
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If you take a collection, you ask many people for money, for a particular reason.
The school took a collection for new books.
of
Preposition
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Made using.
It is a house of cards.
debt
Noun
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If you are in debt, you owe money (normally to a bank).