Alarm | Mean of alarm in English Dictionary

/əˈlɑɚm/

• Noun
• a device that makes a loud sound as a warning or signal
1. The alarm went off when he opened the door.
2. a car alarm
3. The whole town heard the alarm.
4. His long absence from school set (the) alarm bells ringing and we finally called the police.
• a feeling of fear caused by a sudden sense of danger
1. The rumors caused widespread alarm and concern.
2. His parents have expressed alarm about/for his safety.
3. The new developments are being viewed with alarm.
4. She looked around in alarm when she heard the noise.
5. There's no cause for alarm. [=there is no reason to be worried or afraid]
• a warning of danger
1. The dog's barking gave the alarm and the intruders were caught.
2. A passerby saw the intruders and raised the alarm.
3. They have ignored repeated alarms about the dangers of smoking.
4. Economists have raised/sounded the alarm [=have warned people] about a possible recession.
5. Economists have been raising/sounding alarms about a possible recession.
• Verb

• to cause (someone) to feel a sense of danger
1. I didn't mean to alarm you.
2. The rapid spread of the disease has alarmed many people.