골몰해요 · 골몰했어요 · 골몰할 거예요 · 골몰하세요
to be absorbed in, to be preoccupied with
Example
그는 요즘 새 사업 구상에 골몰해 있어요.
These days he's absorbed in planning a new business.
Word parts
Literally 'sunk deep' — fully submerged in one thing.
Good to know
Pattern ~에 골몰하다, suggesting someone so deep in thought they ignore everything else.