burglar alarm
US /ˈbɜːr.ɡlər əˌlɑːrm/
UK /ˈbɜːr.ɡlər əˌlɑːrm/
1.
a device that makes a loud noise to warn people that a crime is happening or has happened
:
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The burglar alarm went off when a cat jumped through the window.
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We need to install a new burglar alarm system for better security.