zero hournoun [ U ]uk /ˈzɪə.rəʊ ˌaʊər/ us /ˈzɪr.oʊ ˌaʊr/
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(Definition of “zero hour” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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Word of the Day
in a manner of speaking
used for saying that something is partly true