VERB 使紧张;使慌张 If you fluster someone, you make them feel nervous and confused by rushing them and preventing them from concentrating on what they are doing.
The General refused to be flustered... 将军没有乱了方寸。
She was a very calm person. Nothing could fluster her. 她是个非常沉着的人。没什么能让她惊慌的。