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1. Literally, at or very near midday (noon). It's only 9 AM and the heat out here is sweltering; by high noon, that sun will be deadly.
2. The peak or most advanced stage of a given period. At the high noon of the economic boom, people spent money on the most ridiculous things. The actor had been a household name at the high noon of his career, but nowadays, there are few who even remember him.
3. The critical or appointed time of a decisive confrontation, crisis, or contest. It's high noon for these two teams, as the result of this game will determine who makes it to the finals.
morning, noon, and night
All day; all the time. I've been working morning, noon, and night around here trying to get the house ready to go up for sale. You've been playing video games morning, noon, and night. I think you should take a break to do some homework.
morning, noon and night
If something happens or is done morning, noon and night, it happens or is done all the time. You get fit by playing the game, day in, day out, morning, noon and night. He thought about Paloma morning, noon and night.
morning, noon, and nightall of the time; constantly.
1993 Tony Parker May the Lord in His Mercy be Kind to Belfast It was the sort [of relationship] where nothing else matters for you except to be with that other person morning, noon and night.