Definition of zero hour in English:

zero hour

Syllabification: ze·ro hour

noun

  • The time at which a planned operation, typically a military one, is set to begin.
    More example sentences
    • Accompanied by your other three team members, you begin at zero hour of the Clone Wars.
    • A few minor adjustments were made to the presentation plan, and we set 3 o'clock as zero hour.
    • As zero hour approached, Spanish-language radio stations broadcast appeals for all able-bodied Cuban-Americans to help.
    Synonyms
    the appointed time, the critical moment, the moment of truth, the point/moment of decision, the Rubicon, the crux
    informal the crunch

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Word of the day skosh
Pronunciation: skōSH
noun
a small amount; a little