alarm

alarm的解释
n. 警报,惊慌,警告,报警器
v. 使...惊慌,警告
alarm的例句
I gave the alarm as soon as I saw the smoke.
我一看见冒烟，就发出了警报。

The news of the radiation leak caused widespread public alarm.
辐射泄露的消息引起了公众的普遍恐慌。