zero hour

• اللحظة الحاسمة التي يُحدَّد فيها بدء حدث مهم أو عملية أو قرار؛ الوقت المحدد لبدء فعل مخطط له.

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

1. Critical momentB2formal

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

   ساعة الصفر

   • 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.

2. Military operation startC1formal

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

   ساعة الصفر

   • 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.