陰曹

hell / the inferno

surname Cao / Zhou Dynasty vassal state

class or grade / generation / plaintiff and defendant (old) / government department (old)

surname Yin

overcast (weather) / cloudy / shady / Yin (the negative principle of Yin and Yang) / negative (electric.) / feminine / moon / implicit / hidden / genitalia

netherworld / Kingdom of the Underworld / Hades

to enter hell