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countable and uncountable, plural sunups
(US) The time of day when the sun appears above the eastern horizon. quotations examples
“Shagbark, that was risky on your part; even where it lies it is much closer than I like, for we shall all have to see it in the morning.”“No, you won’t; it’ll be gone afore sunup.”
1909, Edward S. Ellis, Alden the Pony Express Rider
(US) The change in color of the sky at sunup. examples