밀집해요 · 밀집했어요 · 밀집할 거예요 · 밀집한 (+noun)
to be crowded together, to be densely packed
Example
서울에는 인구가 너무 밀집해 있어요.
The population is too densely packed in Seoul.
Word parts
밀 dense+집 gather
Literally 'densely gathered'.
Good to know
Pronounced [밀찌파다]; often 밀집되다 or 밀집해 있다.