1. 惊慌：alarmist 大惊小怪者 | alarum 惊慌 | alary 翼状的

2. 警报：alarm-scanning and data-logging system 巡回检测报警和参数记录系统 | alarum 警报 | Alaska current 阿拉斯加暖流

3. 惊慌, 警报：alarms and excursions || 喧闹和忙乱 紧张和骚乱 | alarum || 惊慌, 警报 | alary muscle || 翼状肌

4. 闹铃：闹剧一般地farcically | 闹铃alarum | 闹脾气grouch

noun

1. an automatic signal (usually a sound) warning of danger

Synonym: alarmalertwarning signal