barrier; jinx

Explanation

〔魔〕

1. barrier; jinx
An unknown obstacle that keeps things from going well.

2. being evil; being ominous
A place or time in which odd or bad things happen frequently.

3. difficulty; hardship
A thing or situation that is too difficult to overcome.

4. devil; evil spirit
An evil ghost; or a person who does bad things like an evil ghost.

Examples
마가 끼다
마가 들다
마가 씌다

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