Definition of zero hour noun from the Oxford Advanced Learner's Dictionary


zero hour

BrE BrE//ˈzɪərəʊ aʊə(r)//
; NAmE NAmE//ˈzɪroʊ aʊər//
, NAmE//ˈziːroʊ aʊər//
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the time when an important event, an attack, etc. is planned to start It’s five minutes to zero hour.
See the Oxford Advanced American Dictionary entry: zero hour

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