丑 - sign of the ox or cow, 1-3AM, second sign of Chinese zodiac

the Ox (second sign of the Chinese zodiac)

Fire Ox (14th term of the sexagenary cycle, e.g. 1937, 1997, 2057)

day of the ox in midsummer (during the hottest season); dog days of summer

Water Ox (50th term of the sexagenary cycle, e.g. 1913, 1973, 2033)

dead of night; middle of the night; midnight

cursing ritual where one visits a shrine at 2am and nails a doll representing a person to a tree, praying for said person's death

dead of night (when even the trees and plants sleep)

hour of the Ox (around 2am, 1-3am, or 2-4am)

northeast

day of the Ox (esp. in midsummer or midwinter)

dead of the night; midnight

Wood Ox (2nd term of the sexagenary cycle, e.g. 1925, 1985, 2045)