Englishfor English speakers
warn
Verb
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If you warn someone about something, is to make them aware of a danger approaching.
I warn you, lions are dangerous.
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If you warn someone can also be to make them aware that something they do is not accepted.
It is not allowed to steal, I warn you.
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If you warn someone, you give a warning.
of
Preposition
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Made using.
It is a house of cards.