have no idea [not to know] what to do with one's hands and feet;at a loss what to do;be bewildered;confused;lose one's head ;

Afraid of bad publicity, the department had suddenly become very twitchy about journalists.
该部门害怕出现负面宣传,在面对记者时突然变得手足无措。
来源:《柯林斯高阶英汉双解学习词典》
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