Usage: 8 forms in 10 verses
Form Translated As     In Verse(s)
κατεκρατήσατε you held LXX.Jer.40.10
κατεκρατήθησαν they hold firmly LXX.Jer.8.5
κατεκρατήθη he was secure LXX.2Chr.12.1
κατεκράτησεν held him firmly LXX.Jer.50.43
holds firmly LXX.Mic.1.9
κατεκράτησαν they secured LXX.2Chr.12.4
κατεκράτησάν hold firmly LXX.Mic.4.9
κατακρατήσατε secure her LXX.Jer.50.15
κατακράτησον Secure LXX.Nah.3.14
Secure it LXX.Nah.3.14

Liddell-Scott-Jones

κατακρατέω (katakrateō) to hold firmly G:V

κατακρατέω-έω,

prevail over, with genitive person, κατακρατεῖν ἀνδρὸς εἴωθεν γυνή [Refs 4th c.BC+]; also with accusative, τους ἄλλους ἀρετῇ κ. [Refs 3rd c.BC+]:—passive, to be overcome, ὑπὸ νόμου βελτίονος [Refs 7th c.BC+]

__2 absolutely, prevail, gain the mastery, gain the victory, κατὰ μοῖρ᾽ ἐκράτησεν [Refs 5th c.BC+]; Πηνειὸς τῷ οὐνόματι κατακρατέων ἀνωνύμους τοὺς ἄλλους [ποταμοὺς] εἶναι ποιέει [Refs 5th c.BC+]; of an opinion, [Refs 2nd c.AD+]; of planetary influence, predominate, [Refs 5th c.AD+]
__II with accusative of things, gain the mastery over, ἀμάχους ῥώμας, εὔνοιαν, [Refs 1st c.AD+]; win, στέφανον [Refs 1st c.AD+] with genitive _of things_, τῆς προθέσεως become master of one's purpose, [Refs 2nd c.BC+]; retain possession of, τῆς πόλεως [Refs]; master, τῆς Ελληνικῆς διαλέκτου [Refs 2nd c.AD+]
__II.2 digest, concoct, τὰς τῶν σίτων τροφάς [Refs 5th c.BC+]:—passive, τῇ εὐχυλίᾳ [Refs 2nd c.AD+]