false alarm

noun
🔊/ˌfɔːls əˈlɑːm/
🔊/ˌfɔːls əˈlɑːrm/
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  1. a warning about a danger that does not happen; a belief that something bad is going to happen, when it is not假警报;虚惊
    • The fire service was called out but it was a false alarm.消防人员接到报警后出动,但这是假报火警。🔊🔊