[ C ] a warning of danger, usually a loud noise or flashing light警报
B1 [ C ] a device that makes a loud noise to warn of danger警报器;警报装置
A2 [ C ] an alarm clock 闹钟
B1 [ C ] If an electronic device such as a watch or computer has an alarm, it can be set to make a noise at a particular time.闹铃装置;定时装置
More examples
If the alarm sounds, leave the building immediately.
The fire alarm goes off accidentally so often that when it's the real thing nobody will take any notice.
Quick, sound the alarm - there's a fire in the machine room!
Police said the thieves were obviously well acquainted with the alarm system at the department store.
I heard his alarm clock bleeping this morning.
C2 [ U ] sudden worry and fear, especially that something dangerous or unpleasant might happen惊恐,惊慌;担忧
More examples
The birds flew off in alarm when the cat appeared.
There was alarm in the stock market today when prices suddenly began to drop.
The gun shot made the monkeys chatter in alarm.
It's all right, everybody - there's no need for alarm.
A bomb threat caused great alarm in the City this morning.
C1 to make someone worried or frightened令某人担心或害怕
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