bomb alert
noun🔊/ˈbɒm əlɜːt/
🔊/ˈbɑːm əlɜːrt/
(British English) (also bomb scare British and North American English, bomb threat especially in North American English)
an occasion when somebody says that they have put a bomb somewhere and everyone has to leave the area 炸弹恐吓（声称在某处放置炸弹，所有人都得撤离）