You obviously did not bother to read the entire entry at LSJ.It is the LSJ to which you said backed up the KJV translation. It obviously doesn't. Here is the BDAG. It doesn't either.
κατέχω impf. κατεῖχον; fut. καθέξω LXX, 3 pl. κατασχήσουσι (JosAs 16 [p. 64, 18 Bat. and cod. A]); 2 aor. κατέσχον. Pass.: fut. 2 pl. κατασχεθήσεσθε Ruth 1:13; aor. 3 sg. κατεσχέθη LXX (s. ἔχω; Hom.+). Trans. in all mngs. below, except 7.
to prevent the doing of someth. or cause to be ineffective, prevent, hinder, restrain
to hold someone back from going away hold back, hinder, prevent from going away (Hom. et al.; BGU 1205, 27 [28 B.C.]; 37, 6 [50 A.D.];
PFay 109, 11; Gen 24:56; cp. Jos., Ant. 7, 76; Just., A I, 45, 1) Hs 9, 11, 6. ὃν ἐβουλόμην πρὸς ἐμαυτὸν κ. whom I wished to keep with me Phlm 13. Foll. by gen. of the inf. w. article (B-D-F §400, 4) οἱ ὄχλοι κατεῖχον αὐτὸν τοῦ μὴ πορεύεσθαι ἀπ᾿ αὐτῶν Lk 4:42.
hold down, suppress τὶ someth. (γέλωτα X., Cyr. 2, 2, 1; Chariton 3, 7, 4 τ. λύπην; WCrum, Coptic Ostraca p. 4, 522=Dssm., LO 260 [LAE 306]=PGM II 233, no. O 1, 1–3 Κρόνος, ὁ κατέχων τὸν θυμὸν ὅλων τ. ἀνθρώπων, κάτεχε τ. θυμὸν Ὡρι; cp. II, 7, 935f, p 41; Jos., Vi. 233 τ. ὀργήν) τ. ἀλήθειαν ἐν ἀδικίᾳ stifle the truth by unrighteousness/ wickedness Ro 1:18 (cp. JFitzmyer, Ro [AB], ’93, 278; but s. 6 below).
to prevent someone from exercising power, restrain, check (Thu. 6, 29, 3; Appian, Bell. Civ. 2, 149 §622 τοῦ δαίμονος κατέχοντος τὸ πέλαγος=divine power held the sea back until Alexander reached the other shore; PGiss 70, 3 [II A.D.] ἡ ἀναγραφὴ κατέσχεν ἡμᾶς μέχρι ὥρας ἕκτης) ἵνα μὴ κατέξω τ̣ὰ [προσ]|τεταγμένα καὶ ἐπεικίμ̣[εν]α so that I might not delay (carrying out) the instructions and orders AcPl Ha 7, 14f. τὸ κατέχον (Themistocl., Ep. 13, 4) 2 Th 2:6 and ὁ κατέχων vs. 7 mean that which restrains and one who restrains, i.e. what prevents God’s adversary fr. coming out in open opposition to God, for the time being. In an effort to define κ. more specifically here, many interpreters have followed the exegesis of the ancient church (Tertullian) and taken τὸ κ. to be the Roman Empire and ὁ κ. the Emperor (OBetz, NTS 9, ’63, 276–91). An alternative view, as old as Theodore of Mops., but without sustained acceptance, would make τὸ κ. the preaching of Christian missionaries and ὁ κ. the apostle Paul (so OCullmann, Dodd Festschr. ’56, 409–21). These and other attempts to limit more precisely the mng. of these terms in 2 Th invite skepticism because of insufficient textual data (vs. 5 appears to imply in-house information). The concept of the temporary restraining of the forces of hell (cp. Rtzst., Poim. 27 late Egyptian prayer 6, 4 Horus as κατέχων δράκοντα=PGM 4, 994f; cp. 2770 Μιχαὴλ … κατέχων, ὃν καλέουσι δράκοντα μέγαν) does not appear to play any role here.—WBousset, D. Antichrist 1895; NFreese, StKr 93, 1921, 73–77; VHartl, ZKT 45, 1921, 455–75; WSchröder, D. 2. Thess. 1929, 8–15; DBuzy, RSR 24, ’34, 402–31; OCullmann, RThAM 1, ’38, 26–61; JSchmid, TQ 129, ’49, 323–43; OBetz, NTS 9, ’63, 276–91. Difft. CGiblin, Threat to Faith ’67, 167–242, a hostile power. S. also JTownsend, SBLSP 19, ’80, 233–46; RAus, JBL 96, ’77, 537–53; New Docs 3, 28.
to hold back with design hold back τὶ someth. κ. ἐν μυστηρίῳ τὴν σοφὴν αὐτοῦ βουλήν hold back his wise plan as a secret Dg 8:10.
to adhere firmly to traditions, convictions, or beliefs, hold to, hold fast (cp. the lit. sense λαμπάδας ἐν ταῖς χερσίν ParJer 3:2)
keep in one’s memory (Theophr., Char. 26, 2, a word of Homer) εἰ κατέχετε if you hold it fast 1 Cor 15:2.
hold fast, retain faithfully (X., Symp. 8, 26 τ. φιλίαν; TestJud 26:1 τ. ὁδούς) τὸν λόγον Lk 8:15. τὰς παραδόσεις guard the traditions 1 Cor 11:2. τὸ καλόν hold fast what is good 1 Th 5:21; Agr 11. τὴν παρρησίαν βεβαίαν κ. keep the confidence firm Hb 3:6; cp. vs. 14. κ. τὴν ὁμολογίαν ἀκλινῆ 10:23.
to keep in one’s possession, possess (Ps.-Aristot., Mirabilia 159; 160; Polyb. 1, 2, 3; IMagnMai 105, 51 [II B.C.] ἵνα ἔχωσιν κατέχωσίν τε καρπίζωνταί τε; Ezk 33:24; Da 7:18, 22; Ath. 8:3) τὶ someth. Mt 21:38 v.l.; ὡς μηδὲν ἔχοντες καὶ πάντα κατέχοντες 2 Cor 6:10 (DMealand [ZNW 67, ’76, 277–79] cites Ps.-Crates Ep. 7 Hercher=p. 58 no. 7, 8 Malherbe: ἔχοντες μηδὲν πάντ᾿ ἔχομεν, ὑμεῖς δὲ πάντ᾿ ἔχοντες οὐδὲν ἔχετε). Abs. 1 Cor 7:30.
to keep within limits in a confining manner, confine
in prison keep, confine (PFlor 61, 60; BGU 372 I, 16; Gen 39:20; Philo, Leg. All. 3, 21) pass. Χριστιανοὶ κατέχονται ὡς ἐν φρουρᾷ τῷ κόσμῳ they are confined in the world as in a prison Dg 6:7.
by law: ἀποθανόντες ἐν ᾧ κατειχόμεθα having died to that by which we were bound Ro 7:6 (cp. PAmh 97, 17 οὐ κατασχεθήσομαι τῇ ὑποσχέσει; PRyl 117, 13).
by disease (Diod. S. 4, 14, 5; Philo, Op. M. 71, Congr. Erud. Grat. 138; PSI 299, 3 κατεσχέθην νόσῳ; act., Jer 13:21; Jos., Vi. 48) Lk 4:38 D; J 5:4 v.l.
to have a place as one’s own, take into one’s possession, occupy (Hdt. 5, 72 et al.; PAmh 30, 26 [II B.C.] τὴν οἰκίαν) τὸν ἔσχατον τόπον Lk 14:9 (cp. Philosoph. Max. 491, 69 τὸν κάλλιστον κατέχουσι τόπον; Jos., Ant. 8, 104). Cp. GPt 5:15.—AcPl Ha 5, 28 [κατ]ε̣ῖ̣χεν αὐτὰς ἔκστασις perh. means astonishment overcame them.
lay claim to, legal t.t. Ro 1:18 (the point is that a claim is made for truth, which is denied in practice, cp. vss. 22f; s. FDanker, in Gingrich Festschr. 93. For a difft. interpr. see 1b above).
hold course, nautical t.t., intr. (Hdt. 7, 188 κατέσχε ἐς τὸν αἰγιαλόν; Dicaearchus, fgm. 85 W. εἰς Δῆλον κατέσχε; Polyb. 1, 25, 7; Philostrat., Vi. Apoll. 4, 13 p. 133, 5; 5, 18 p. 178, 13; cp. Jos., Ant. 1, 204) κατεῖχον εἰς τὸν αἰγιαλόν they headed for the beach Ac 27:40.
Perh. in the sense of determine (cp. προσέχω 2c) κατεχόντων εἰ ἄρα ἀληθῶς ἀπέθανεν AcPt Ox 849, 2f; s. ed.’s notes.—M-M. EDNT. TW. Spicq.
I can keep going. There are more.
Incidentally you say more than you ought. Maybe keep your subjective comments about people out of it. It does nothing to exhort or edify.

I zoomed in on the entry for you to see here:

Here it is in the KJV:

Don't believe the screenshots?
Just click on the links below to check them out!
Sources:
Side Note: I also provided an older lexicon which you did not verify or check either.
Anyone can simply go back and see it for themselves and see that your research on basic facts cannot be trusted.
....