smoke alarm
smoke alarm — noun
1. a safety device mounted on a ceiling or wall that produces a piercing beep when
a safety device mounted on a ceiling or wall that produces a piercing beep when it detects smoke, warning people inside a building to get out because there may be a fire
The smoke alarm in the kitchen went off when Michael burned the toast.
go off — phrasal verb for alarm activation
Beatrix replaced the battery in the smoke alarm every spring.
replace the battery — routine maintenance collocation
A loud beep from the smoke alarm woke the hostel residents at 3 a.m.
Paloma tested the smoke alarm by pressing the button until it beeped.
Building rules require a working smoke alarm on every floor of the apartment block.
- smoke detector
more common in British English; emphasises the detection function rather than the warning sound
- fire alarm
broader term that can include heat detectors and manual pull stations; often used for the whole building alert system
- fire detector
more technical term, less common in household settings
文法句型
usually [a/the + ~]
用法筆記
Frequently appears with the phrasal verb 'go off' (the alarm activates because it detects smoke). The opposite — an alarm that fails to activate — is described as 'failed to go off' or 'did not go off'.