마른하늘에 날벼락이에요 · 마른하늘에 날벼락 같은 소식
a bolt from the blue, a sudden disaster (lit. lightning from a clear sky)
Example
갑자기 회사가 문을 닫는다니, 마른하늘에 날벼락이에요.
The company is suddenly shutting down? It's a bolt from the blue.
Word parts
마른하늘 is a dry, cloudless sky and 날벼락 a sudden thunderbolt: disaster with no warning at all.
Good to know
Pronounced [마른하느레 날벼락]. Same meaning as the four-character idiom 청천벽력; common in news about sudden accidents or layoffs.