The time of day when the sun is at its highest point, typically noon.

A metaphorical time or moment of confrontation or decision.

निर्णायक क्षण

English Usage: The negotiation reached high noon when both sides refused to back down.

Hindi Usage: बातचीत उस समय निर्णायक क्षण पर पहुँच गई जब दोनों पक्ष पीछे हटने को तैयार नहीं थे।