This is the 8593rd most frequent Korean word.
가린
"가린" means "covered" or "hidden."
Here, "가린" (to cover or hide) is used to describe physically covering something, such as a window in this case.
그는 커튼으로 창문을 가린다.
He covers the window with a curtain.
In this sentence, "가린" is employed to mean speaking about covering one's face, indicating a figurative action of concealing.
그녀는 자신의 얼굴을 손으로 가린다.
She covers her face with her hand.
This usage of "가린" is metaphorical, suggesting that the fog is concealing or visually obscuring the mountain.