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

 

zero hour

 noun
noun
BrE BrE//ˈzɪərəʊ aʊə(r)//
 
; NAmE NAmE//ˈzɪroʊ aʊər//
 
, NAmE//ˈziːroʊ aʊər//
 
[uncountable]
 
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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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