n.

1. 警报；警报器[C]
   The doorkeeper gave the alarm as soon as he saw the smoke.

   守门人一看见冒烟就发出警报。

2. 闹钟[C]（= alarm clock）
3. 惊慌，恐惧，担忧[U]
   "What's up?" he asked in alarm.

   “出什么事了？”他惊恐地问道。

vt.

1. 向……报警，向……告急
2. 使惊慌不安，使恐惧
   "Don't be alarmed. I am no robber."

   “别慌，我不是强盗。”

3. 打扰

n.

1. anxious or frightened awareness of danger.
   ▸a warning of danger.
2. a warning sound or device.

v.

1. frighten or disturb.
2. (be alarmed) be fitted or protected with an alarm.