/ˈflʌstə(r) ||; ˈflʌstɚ/verb [T] (usually passive 通常用于被动语态) to make sb feel nervous and confused (because there is too much to do or not enough time) 使慌乱(因为工作太多或时间不够):
Don't get flustered -- there's plenty of time. 别手忙脚乱的,时间多着呢。
fluster noun [sing]
I always get in a fluster before exams. 考试前我总是手忙脚乱。