Means 'because of'. Attached to nouns.
Usage
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Noun + 때문에: For reasons based on a person or thing.
•
For verbs, you must use a different form like -기 때문에.
Nuance
It indicates a clear cause-and-effect relationship. Use it carefully as it can sometimes sound like you are blaming someone/something.
In Context
일 때문에 바빠요.
I am busy because of work.
눈 때문에 길이 막혀요.
Roads are blocked because of snow.