Strong's Concordance G5020

Original Word: ταρταρόω
Transliteration: tartaróō
Phonetic Spelling: tar-tar-o'-o
[ταρταρόω] from Τάρταρος (the deepest abyss of Hades); to incarcerate in eternal torment

Usages throughout the bible

2 Peter 2:4 - For if God spared not the angels that sinned, but cast them down to hell, G5020 and delivered them into chains of darkness, to be reserved unto judgment;