zero hour Definition in the Cambridge English Dictionary
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Definition of “zero hour” - English Dictionary

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