zero hour Definition in Cambridge British English Dictionary
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Definition of "zero hour" - British English Dictionary

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zero hournoun [U]

uk   us  
the time at which something, especially some type of military activity, is planned to begin Indian English in the Indian parliament, the time during which members of parliament can ask questions without arranging to ask them first
Translations of “zero hour”
in Chinese (Traditional) 行動開始時間, (尤指軍事行動的)發動時刻…
in Chinese (Simplified) 行动开始时间, (尤指军事行动的)发动时刻…
(Definition of zero hour from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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