publicalarm

noun
UK /ˈpʌblɪk əˈlɑːm/
US /ˈpʌblɪk əˈlɑːrm/

A loud warning that tells everyone in a place to be careful or to leave.

When the fire started, the publicalarm rang and everyone went outside.


OTHER MEANINGS

2. A feeling of worry shared by many people at once.

The strange news caused a publicalarm across the town.

3. A device that makes a loud noise to warn people of danger.

They tested the publicalarm on the building every Monday.

4. A public announcement asking people to stay calm or take action.

The storm publicalarm told families to stay indoors.