#5020 ταρταρόω tartaroo {tar-tar-o'-o}

 from Tartaros (the deepest abyss of Hades); TDNT - n/a; v

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) the name of the subterranean region, doleful and dark, regarded by
    the ancient Greeks as the abode of the wicked dead, where they suffer
    punishment for their evil deeds; it answers to Gehenna of the Jews
 2) to thrust down to Tartarus, to hold captive in Tartarus

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - cast down to hell 1; 1

—Exhaustive Concordance (KJV Translation Frequency & Location)