덜컥

with a thud; with a thump

Explanation

1. with a thud; with a thump
A word describing one's heart almost stopping because one is very surprised or scared.

2. suddenly
A word describing an incident suddenly occurring.

Examples

가슴이 덜컥 내려앉다

겁이 덜컥 나다

승규는 혼자 집을 지키다가 덜컥 겁이 나서 이불 속으로 숨었다

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