1.
bolt from the blue; sudden shock
An unexpected, shocking event that comes without warning, like thunder from a clear blue sky.
Etymology
青天 (clear/blue sky) + 霹靂 (thunderclap)
From classical Chinese poetry. 霹靂 specifically refers to a sudden, loud thunderclap.
Forms
Usage
Used to describe completely unexpected news or events, typically shocking or surprising. The event itself can be either positive or negative, but the emphasis is on its unexpectedness.