Japanese edit

Kanji in this term
せい
Grade: 1
てん
Grade: 1
へき
Hyōgaiji
れき
Hyōgaiji
on’yomi
Alternative spelling
靑天の霹靂 (kyūjitai)

Etymology edit

Compound of 青天 +‎ +‎ 霹靂, compare Chinese 晴天霹靂晴天霹雳 (qíngtiānpīlì)

Noun edit

(せい)(てん)(へき)(れき) (seiten no hekireki

  1. (idiomatic) out of the blue, bolt from the blue, great surprise
    Synonym: 寝耳に水 (nemimi ni mizu)