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NounEdit

zero hour (plural zero hours)

  1. The scheduled time for the start of some event, especially a military operation; H-hour
    • 1937, Siegfried Sassoon, The Complete Memoirs of George Sherston, London: Faber, page 339 (1972 paperback edition):
      Zero hour was forty-five minutes after midnight. Two companies were to attack on a 600-yard front …

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