be disconcerted;all in a fluster [flutter];be at a loss as to what to do;be panic-stricken ;
Unexpected company at supper time caught Mrs Ball flat-footed.
晚餐时间突然来了大批客人,使得鲍尔太太仓皇失措。
The teacher's question caught him flat-footed.
老师的讯问使他仓皇失措.
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