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

zero hour

noun
 
/ˈzɪərəʊ aʊə(r)/
 
/ˈzɪrəʊ aʊər/
[uncountable]
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  1. the time when an important event, an attack, etc. is planned to start
    • It’s five minutes to zero hour.
See zero hour in the Oxford Advanced American Dictionary
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ripple effect
noun
 
 
From the Topic
Change, cause and effect
C2
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