expression, suru verb (irregular)
lose composure; be upset; lose one's head
Describes a state of mental shock or confusion where one cannot think clearly. Often used when something unexpected happens.
See also: 動転
突然の知らせに気が動転して、何も言えなかった。
I was so upset by the sudden news that I couldn't say anything.
I lost my composure when I saw the accident scene.