Quick Definition
ταρταρόω v. I thrust down to Tartarus
Strong's Definition
from Tartaros (the deepest abyss of Hades); to incarcerate in eternal torment
KJV Usage: cast down to hell
UBS Dictionary of the Greek New Testament
verb
1.25 · Geographical Objects and Features · Regions Below the Surface of the Earth
to hold in Tartarus, to cast into hell (derivative of τάρταρος ‘Tartarus,’ ‘hell,’ as a place of torture or torment, not occurring in the NT) to cast into or to cause to remain in Tartarus In many cases it is confusing to add still another term for a designation of hell by transliterating the Greek τάρταρος, and so most translators have preferred to render ταρταρόω as either ‘to cast into hell’ or ‘to keep in hell,’ thus using for ‘hell’ the same term as is employed for a rendering of the Greek term γέεννα (1.21).
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ταρταρόω, -@: 1 aor. ptcp. ταρταρώσας ; (τάρταρος, the name of a 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 the Gehenna of the Jews, see γέevva); to thrust down to Tartarus (sometimes in the Scholiasts) [cf. W.25 (24) n.]; to hold captive in Tartarus : τινὰ σειραῖς [q. V.] ζόφου, 2 Pet. ii. 4 [A. V. cast down to hell (making the dat. depend on rapédwxev) ].
Mounce Concise Greek Dictionary
ταρταρόω tartaroō 1x
to cast or thrust down to Tartarus or Gehenna, 2 Pet. 2:4*
Abbott-Smith Greek Lexicon
*† ταρταρόω, -ῶ
(< Τάρταρος, a Greek name for the underworld, esp. the abode of the damned),
to cast into hell: II Pe 2:4 (v. Mayor, in l.).†
Liddell-Scott-Jones — Greek-English Lexicon
ταρταρόω (tartaroō) — hell: Tartarus. Ταρτᾰρ-όω, cast into Tartarus or hell, [NT+8th c.BC+] Τάρτᾰρ-ος, ὁ, also ἡ [Refs 8th c.BC+]; later, the nether world generally, [Refs 8th c.BC+]; ἀπέραντος, κελαινός, [Refs 4th c.BC+]; Ταρτάρου μελαμβαθὴς κευθμών[LXX]
II. personified as husband of Gaia and father of Typhoeus, [Refs 8th c.BC+]; ὦ Γᾶς παῖ καὶ Ταρτάρου, of Cerberus, [Refs 5th c.BC+]