dooralarm
nounUK /ˈdɔːrəˌlɑːm/
US /ˈdɔːrəˌlɑːrm/
A door alarm is a small machine that makes a loud noise when someone opens a door.
The door alarm beeped when we came in the shop.
RELATED WORDS
OTHER MEANINGS
2. A warning sound that tells you a door is not shut properly.
The fridge door alarm went off because the door was left open.
3. A device that rings to let you know someone has entered a building.
The door alarm rang when the delivery man walked in.
4. A feature on a car that makes a sound if a door is open while driving.
The car's door alarm chimed until I closed the back door.