The time at which a planned operation, typically a military one, is set to begin.
- Accompanied by your other three team members, you begin at zero hour of the Clone Wars.
- A few minor adjustments were made to the presentation plan, and we set 3 o'clock as zero hour.
- As zero hour approached, Spanish-language radio stations broadcast appeals for all able-bodied Cuban-Americans to help.
the appointed time, the critical moment, the moment of truth, the point/moment of decision, the Rubicon, the crux
informal the crunch
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.