under the earth

Strong’s Dictionary of Greek Words:

Greek:
καταχθόνιος
Transliteration:
katachthonios
Phonic:
kat-akh-thon’-ee-os
Meaning:
from 2596 and χθών (the ground); subterranean, i.e. infernal (belonging to the world of departed spirits)
KJV Usage:
under the earth