set an alarm
collocation设闹钟
I set an alarm for 7 a.m.
我把闹钟设在早上7点。
警报；警铃
先理解核心含义，再看它在真实句子里的用法。
警报；警铃
a sound or signal that warns of danger or gives notice of a problem
The smoke detector set off the fire alarm, and everyone evacuated the building.
烟雾探测器触发了火警警报器，所有人都撤离了大楼。
敌人来袭时的武装召集
A summons to arms, as on the approach of an enemy.
意识到危险而产生的恐惧
fear resulting from the awareness of danger
警告危险的声音或信息
Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.
发出不良事件信号的装置
a device that signals the occurrence of some undesirable event
She felt a growing alarm as the storm approached their campsite.
随着风暴逼近他们的营地，她感到越来越惊恐。
My car alarm went off when a bird landed on the hood.
一只鸟落在引擎盖上时，我的汽车警报器响了。
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设闹钟
I set an alarm for 7 a.m.
我把闹钟设在早上7点。
闹钟
My alarm clock didn't go off this morning.
我的闹钟今天早上没响。
拉响警报
Firefighters sounded the alarm and evacuated the building.
消防员拉响警报并疏散了大楼。
假警报
The fire drill turned out to be a false alarm.
消防演习原来是个假警报。
报警系统
They installed a new alarm system in the house.
他们在房子里安装了新的报警系统。
引起恐慌
The news caused widespread alarm among the residents.
这条消息在居民中引起了广泛恐慌。
警钟
The sudden drop in sales set alarm bells ringing.
销售额的突然下降敲响了警钟。
虚惊一场
The fire was a false alarm.
这场火灾是虚惊一场。
发出警报
He raised the alarm when he saw smoke.
他看到烟雾时发出了警报。
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联想闹钟响起时惊呼'啊！啦！'(alarm)，感到惊恐。
Register: neutral; Contexts: 家庭, 办公室, 公共场所; Note: 本词义指报警装置（如闹钟、防盗警报器），通常用于日常场景，中性。
All words above rhyme with the stressed syllable /ɑːrm/ of alarm (əˈlɑːrm). Note: 'calm' (kɑːm) looks similar but lacks the /r/ sound and does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.