zero hour
緊急關鍵時刻
口語·強調緊急時刻
英文釋義
the time when something important or decisive is about to happen
例句
It's zero hour for the team; we need to decide now.
典故來源
源自軍事術語，指發起進攻的精確時間，后泛指關鍵時刻。