Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ανέρρηξεν he tore asunder LXX.2Kgs.15.16
ανέρρηξαν they tore asunder LXX.2Kgs.2.24

Liddell-Scott-Jones

ἀναρρήγνυμι (anarrēgnumi) to tear asunder G:V

ἀναρρήγνυμι

(ἀναρρηγνύω [Refs 2nd c.AD+], break up, μή οἱ ὕπερθε γαῖαν ἀναρρήξειε Ποσειδάων[Refs 8th c.BC+]; . τάφον dig a grave, [Refs 5th c.BC+]

__2 break through, break open, τεῖχος ἀναρρήξας[Refs 8th c.BC+]:—passive, νῆες ἀναρραγεῖσαι τὰς παρεξειρεσίας[Refs 5th c.BC+]
__3 tear open a carcase, of lions, [Refs 8th c.BC+]; of hounds, [Refs 5th c.BC+]; of Ajax, δίχα ἀνερρήγνυ was cleaving them asunder, [Refs 5th c.BC+]
__II make to break forth, λόγον[Refs 5th c.BC+]; πόλιν make it break out, excite greatly, [Refs 1st c.AD+] —passive, with perfect ἀνέρρωγα, burst forth, break, of sores, [Refs 5th c.BC+]; of floods, [Refs 4th c.BC+]; of volcanoes, [Refs 5th c.BC+]; of persons, ἀναρρήγνυσθαι πρὸς ὀργήν, εἰς ἅπαν τόλμης, [Refs 1st c.AD+]
__III intransitive, break or burst forth, δέδοιχ᾽ ὅπως μὴ.. ἀναρρήξει κακά[Refs 5th c.BC+]perfect participle ἀνερρωγώς, of the mouth of carnivorous animals, with a wide gape, στόμα ἔχειν ἀνερρωγός[Refs 4th c.BC+]; of the animals themselves, τὰ καρχαρόδοντα πάντα ἀνερρωγότα[Refs]—Pres. ἀναρρήττω, [Refs 1st c.BC+]