Synonyms of zero hour
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• The anxiety that had been building within him reached a crisis.
critical pointclimaxpoint of no returnheightconfrontationcrunch (informal)turning pointculminationcruxmoment of truthclimacterictipping point
turning pointA turning point is a time at which an important change takes place which affects the future of a person or thing.
• The vote marks something of a turning point in the war.
Thesaurus for zero hour from the Collins English Thesaurus