false alarm◼◼◼(thing or occurrence initially causing fear, etc. but subsequently seen to be no cause for concern) noun [UK: ˈfɔːls ə.ˈlɑːm] [US: ˈfɔːls ə.ˈlɑːrm]
false alarm◼◼◼(warning sound that turns out to be erroneous) noun [UK: ˈfɔːls ə.ˈlɑːm] [US: ˈfɔːls ə.ˈlɑːrm]