깜박하다

flicker; waver

Explanation

[깜바카다]

1. flicker; waver
For light to brighten and then go dim, or dim and then go bright in quick succession; to make something do in such a way.

2. blink
For one's eyes to be closed and open again and again; to make them become that way.

3. be blurred
Not to remember or pay attention.