HSK 7-9
措手不及
cuòshǒu-bùjíno time to deal with it (idiom); caught unprepared
突然停电让大家措手不及。
Tū rán tíng diàn ràng dà jiā cuò shǒu bù jí.
The sudden power outage caught everyone unprepared.
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Appears across levels (7-9) in the HSK 3.0 word list.