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Exactly 12:00 noon, on the dot. So called because both hands of an analog clock point "straight up" when it is precisely noon. "Straight-up midnight" is used the same way.
We had to be there at straight-up noon, and not a minute late.
by JCEG December 10, 2006
4 2

Words related to straight-up noon:

apex heat of the day meridian straight-up midnight zenith