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Definition of zero hour:

Synonyms for zero hour:

countdown, jump-off, H-hour, the moment of truth, attack, crunch time, peak, extremity, Dunkirk, exigence, crisis, climax, conjuncture, the point of no return, exigency, head, crossroads, target day, boiling point, D-day, breaking point, watershed, the time, climacteric, crossroad, highlight, decide, flash point, pass, juncture, crunch, tinderbox, milestone, turning point, clutch.