alarm clock

US /əˈlɑːrm klɑːk/
UK /əˈlɑːrm klɑːk/
"alarm clock" picture
1.

闹钟

a clock that can be set to wake a person at a particular time by sounding a buzzer or bell

:
I set my alarm clock for 6 AM.
我把闹钟定在早上6点。
The loud ringing of the alarm clock startled me awake.
闹钟响亮的铃声把我吓醒了。