Meaning of the word "zero hour" in English

What does "zero hour" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

zero hour

US /ˈzɪroʊ ˈaʊər/
UK /ˈzɪroʊ ˈaʊər/
"zero hour" picture

Noun

1.

the time at which a planned operation or event is scheduled to begin

Example:
The troops were ready for zero hour, awaiting the command to advance.
The launch countdown began, signaling that zero hour was approaching.
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