zero hour

The critical moment when an important event, operation, or decision is scheduled to begin; the time set for the start of a planned action.

ruКритический момент, когда запланировано начало важного события, операции или решения; время, установленное для начала запланированного действия.esMomento crítico fijado para el comienzo de una operación, acción o evento importante, especialmente en contexto militar o de planes coordinados; la hora cero en la que algo decisivo está programado para iniciarse.frMoment critique prévu pour le début d'une opération ou d'un événement important ; heure fixée pour le lancement d'une action planifiée.deDer Zeitpunkt, zu dem eine wichtige Handlung, Operation oder Entscheidung beginnen soll; der kritische oder entscheidende Moment, in dem etwas Bestimmtes geschehen muss.ptMomento crítico e decisivo em que está previsto o início de um evento, operação ou decisão importante; hora marcada para o começo de uma ação planejada.zh指预定的重要行动、事件或决策开始的时刻，特别是关键或决定性的时刻；也可指某一行动开始的指定时间。arاللحظة الحاسمة التي يُحدَّد فيها بدء حدث مهم أو عملية أو قرار؛ الوقت المحدد لبدء فعل مخطط له.

1. Critical moment B2 formal

   The time when an important event or action is scheduled to begin; the decisive moment.

   • Zero hour for the attack was set at dawn.
   • The team waited nervously for zero hour to launch the product.
   • At zero hour, the countdown began for the rocket launch.

   ruРешающий моментeshora cerofrheure HdeStunde XptHora Hzh关键时刻arساعة الصفر

2. Military operation start C1 formal

   The exact time designated for the start of a military operation.

   • The general ordered the troops to be ready by zero hour.
   • Zero hour was postponed due to bad weather conditions.
   • All units must be in position before zero hour.

   ruЧас начала военной операцииeshora cero (militar)frheure HdeStunde NullptHora Hzh军事行动开始时刻arساعة الصفر