D defs.my
Entry 1 sense Webster, 1913

Sunup

/sŭnʹŭp/ · Sun·up · IPA /ˈsʌnʌp/
01 n. Sunrise.
  1. 1.
    Sunrise.[Local, U.S.]
    “Such a horse as that might get over a good deal of ground atwixt sunup and sundown.” Cooper.