zero hour

[zero hour] {n.}

1. The exact time when an attack or other military action is supposed to start.

* /Zero hour for the bombers to take off was midnight./

2. The time when an important decision or change is supposed to come; the time for a dangerous action.

* /It was zero hour and the doctor began the operation on the man./

* /On the day of the championship game, as the zero hour came near, the players grew nervous./

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Source: A Dictionary of American Idioms


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