Difference between to prevent and to block in Korean
방지하다·막다

방지하다to prevent
(방지하다) means to stop something bad from happening before it happens. You can use it for accidents, sickness, mistakes, fire, loss, and other problems. It is often used in sentences like “to prevent accidents” or “to prevent colds.”

막다to block
막다 means "to block" or "to stop something from passing through." You can use it when a person or thing closes a way, covers an opening, or gets in the way. It is also used in simple everyday situations like blocking a door, a road, sunlight, or even interrupting someone.
The difference
to prevent (방지하다) and to block (막다) are nearby Korean vocabulary items learners often meet together. Use “to prevent” when (방지하다) means to stop something bad from happening before it happens. You can use it for accidents, sickness, mistakes, fire, loss, and ot… Use “to block” when 막다 means "to block" or "to stop something from passing through." You can use it when a person or thing closes a way, covers an opening, o…