Strongs definition: ταρταρόω; from Τάρταρος (the deepest abyss of Hades); to incarcerate in eternal torment:—cast down to hell.
Appearances: Total x1
Cast down to hell (x1) 2 Peter 2:4
What does it refer to?
There are two schools of thought here.
The first is that ‘Tartaros’ is a special place where the fallen angels are sent and tormented until they are finally thrown into the lake of fire. Vine’s expository Dictionary of New Testament Words writes : “The verb tartaroo, translated "cast down to hell" in 2Pe 2:4, signifies to consign to Tartarus, which is neither Sheol nor Hades nor Hell, but the place where those angels whose special sin is referred to in that passage are confined "to be reserved unto judgment;" the region is described as "pits of darkness," RV.”
The second is that the word, according to Thayer’s Greek Lexicon, is a verb which simply means to cast down to hell.
When crossed with Mythology, the Titans were locked up in Tarturus, a special prison that is meant to subdue these powerful beings.
The scriptures don’t make this kind of distinction, and we read in Rev 20 that the devil, and his angels, along with death and hell (hades) get thrown into the lake fire. Sounds like it could just be another compartment within hades.
At the end of the day, does not change anything doctrinally.
Who will go there?
This is the only reference in regards to the temporary destination of fallen angels.
Length of its duration
If it is another compartment of Hades, its existence will continue until it gets cast into the lake of fire.
Verse
[2Pe 2:4 KJV] 4 For if God spared not the angels that sinned, but cast [them] down to hell, and delivered [them] into chains of darkness, to be reserved unto judgment;