local, chiefly U.S. [f. SUN sb. + UP adv., after SUNDOWN.] Sunrise.
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, Pattersons regiment had left the encampment.
1873. Joaquin Miller, Life amongst the Modocs, viii. 901. Why we should tear up the earth, toil like gnomes from sun-up to sun-down was to them more than a mysteryit was a terror.
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.
1899. G. H. Russell, Under the Sjambok, x. 105. It is a Boer custom to call and drink coffee just after sun-up.