驚慌失措

Simplified: 惊慌失措

On the HSK 7-9 vocabulary list, at CEFR level C1.

jīnghuāngshīcuò ㄐㄧㄥ ㄏㄨㄤ ㄕ ㄘㄨㄛˋ

    • to lose one's head out of fear (idiom)

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Sources