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零时;发动(进攻等的)时刻
    • It’s five minutes to zero hour.从五分钟到零时。