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English definition of “false alarm”

false alarm

noun [C] uk   us  
an occasion when people wrongly believe that something dangerous or unpleasant is happening or will happen: Three fire engines rushed to the school only to discover it was a false alarm. She thought she was pregnant, but it turned out to be a false alarm (= she was not).
(Definition of false alarm from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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