qíng tiān pī lì
lit. thunderclap from a clear sky (idiom)
fig. a bolt from the blue
晴
qíng
clear
天
tiān
day
霹
pī
used in 霹靂|霹雳[pi1 li4] and 霹雷[pi1 lei2]
雳
lì
used in 霹靂|霹雳[pi1 li4]
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