내려앉다

Meanings

sit down onTo sit down on something.
collapse; cave inFor a building, bridge, etc., to collapse, or for a flat area to sink.
become dark; become foggyFor fog, darkness, etc., to spread.
be worriedTo be worried with shock.
be demotedTo be transferred to a lower position.

Examples from Lessons (3)

심장 이 쿵 하고 내려앉을 만큼 설렌다는 뜻 이야.
It means you're so excited that your heart feels like it's thumping and dropping.
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마음 이 쿵 하고 내려앉을 정도 로 설레는 순간 을 뜻합니다.
It refers to a moment so heart-fluttering that your heart feels like it drops with a thud.
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어제 드라마 보면서 진짜 심장 이 내려앉는 줄 알았어.
I thought my heart was going to sink while watching the drama yesterday.
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Grammar in These Examples

-(으)ㄹ 것Level 3Future tense noun modifier -ㄴ/는/ㄹ 만큼Level 5Enough to, as much as -는/ㄹLevel 1Verb noun modifier -(으)ㄹ 정도이다Level 4To the extent of