Englishfor English speakers
involved
Adjective
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If X is involved (in Y), X does Y or is connected to Y
My teacher's very involved in politics.
—
If something is involved, it is complicated.
I can't explain it. It's all rather involved.
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
debt
Noun
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If you are in debt, you owe money (normally to a bank).