警報機(けいほうき)

けいほうき
noun
alarm; warning device; siren
electronics
1. alarm; warning device; siren
A device that sounds or flashes an alarm to warn of danger, such as at railroad crossings, in buildings for fire safety, or in security systems.
警報機(けいほうき)が鳴(な)った。
The alarm sounded.
踏切(ふみきり)の警報機(けいほうき)が鳴(な)り始(はじ)めた。
The warning bell at the railroad crossing started ringing.
火災(かさい)警報機(けいほうき)の設置(せっち)が義務(ぎむ)付(づ)けられている。
The installation of fire alarms is mandatory.

Usage

警報機(けいほうき) is a general term for any warning or alarm device. The most common contexts are 踏切(ふみきり) (railroad crossings), where both 警報機(けいほうき) and 遮断機(しゃだんき) (barrier gate) work together, and 火災(かさい)警報機(けいほうき) (fire alarms) in buildings.

Forms

警報(けいほう) (alarm, warning) + 機(き) (machine, device).

Common collocations

Related Words

Related: 遮断機(しゃだんき) (crossing gate)
Related: 踏切(ふみきり) (railroad crossing, level crossing)
general
Added 2026.3.11 17:07 · Revised 2026.10.11 9:21
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