English version

false alarm

From Longman Dictionary of Contemporary Englishfalse alarmˌfalse aˈlarm noun [countable]  MISTAKEa situation in which people wrongly think that something bad is going to happen Fire fighters responded to a false alarm at one of the college dormitories. The patient was okay – it was a false alarm.
Examples from the Corpus
false alarmYour apprehension is based on the fear that the change might be a false alarm.But the patient was okay, it was a false alarm, please thank them and send them on their way.Those genes would produce a harmless protein that, once inside the body, would sound the false alarm of infection.
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