ZERO HOUR • DICTIONARY ONE.COM • Definition of Zero hour

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/zˈɪroʊ ˈaʊər/ Listen

Zero hour

noun

The time set for the start of an action or operation.

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Etymology of 'Zero hour'

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"Zero hour" Quotes from Famous Books

... life, despite the lost arms and legs which they scarcely seem to regret; their souls still triumph over the body and the temporal. As they hobble through the streets of London, they display the same gay courage that was theirs when at zero hour, with a fifty-fifty chance of death, they hopped over the ...

— The Glory of the Trenches • Coningsby Dawson

... to the earth, we were making two complete round trips. We had just arrived in Great-New York, this May evening, from Grebhar, Venus Free State. With only five hours in port here, we were departing the same night at the zero hour for Ferrok-Shahn, capital ...

— Astounding Stories of Super-Science, March 1930 • Various

... would have been fittingly celebrated but for the fact that five o'clock the following morning had been designated as "zero hour" for the greatest drive ever undertaken by Americans on foreign soil. He had arrived just in time to hurl himself into the feverish preparations for the support which all air units must give the massed ground forces that would hurl themselves upon the supposedly impregnable ...

— Aces Up • Covington Clarke

... constitution certainly did not believe that comradeship would be consecrated and sanctified by anything of a selfish character under the guise of mutual helpfulness. Certainly not the comradeship that made bearable the zero hour in the trenches or the watch ...

— The Story of The American Legion • George Seay Wheat