local, chiefly U.S. [f. SUN sb. + UP adv., after SUNDOWN.] Sunrise.

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1847.  Longfellow, in Life (1891), II. 83. In a letter from Tampico to the N. C. Fayetteville Observer (is the writer a Carolinian ?), I find the Anglo-Saxon expression sun-up, for sunrise. ‘By sun-up, Patterson’s regiment had left the encampment.’

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1873.  Joaquin Miller, Life amongst the Modocs, viii. 90–1. Why we should tear up the earth, toil like gnomes from sun-up to sun-down … was to them more than a mystery—it was a terror.

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1896.  T. J. Mackey, in Peterson Mag. (N. S.), VI. 265/2. He [Robert E. Lee] spent his vacations in hunting,… on foot from sunup to sundown.

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1899.  G. H. Russell, Under the Sjambok, x. 105. It is a Boer custom to call and drink coffee just after sun-up.

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