BDAG (3rd ed., 904-905) splits the New Testament material across two lemmata. Under ῥήγνυμι it gives (1) "tear, break, burst" (the wineskins of Matthew 9:17, Mark 2:22, Luke 5:37, and, with a personal object, "tear in pieces, mangle" at Matthew 7:6) and (2) "let break forth, break out" of joyful vocalization at Galatians 4:27, supplying εὐφροσύνην on the analogy of LXX Isaiah 49:13 and 52:9. Under a separate lemma ῥήσσω it distinguishes the byform of ῥήγνυμι from epic ῥήσσω (Attic ῥάττω) "to cause to fall down, throw down", and locates Mark 9:18 and Luke 9:42 there, citing Wisdom 4:19 and Euripides, Bacchae 633. LSJ keeps a single lemma but isolates the ῥήσσω form under II and adds a fighters' sense "to fell, knock down" at Demosthenes 21.63, remarking that ῥάσσω was more usual for that meaning, while placing ῥῆξον καὶ βόησον under A.4 alongside the classical idiom ῥῆξαι φωνήν (Herodotus 1.85, 2.2, 5.93; Aristophanes, Nubes 357, 960; Euripides, Supplices 710). Louw and Nida independently distribute the occurrences across three domains: 19.44 (physical impact) for the wineskins, 33.85 (communication) for Galatians 4:27, and a separate "throw violently to the ground" entry for the exorcism passages. Chantraine (DELG), Frisk (GEW) and Beekes (EDG 1282-1283) derive ῥήγνυμι from PIE *u̯reh₁ǵ- "break, tear" (Aeolic εὐράγη with preserved digamma; Lithuanian rėžti; Old Church Slavonic rězati; the ablaut series ῥηγ-/ῥωγ-/ῥαγ-), and treat ῥάσσω/ἀράσσω "strike, dash" as etymologically separate and probably onomatopoeic, Beekes calling the association of the two families paretymological. The two present stems ῥήγνυμι and ῥήσσω/ῥήττω are principal-part variants, the later present formed on the pattern πήγνυμι : πήσσω from the aorist ἔρρηξα. For Mark 9:18 and Luke 9:42 the dominant reading (Vincent Taylor; Swete; Cranfield, CGTC; France, NIGTC 366; Marcus, AYB 27A; Yarbro Collins, Hermeneia 435; Evans, WBC 34B; Pesch, HThKNT; Fitzmyer, AB Luke) is "dashes/hurls him down", supported by Wisdom 4:19 (ῥήξει αὐτοὺς ἀφώνους πρηνεῖς), Artemidorus, Oneirocritica 1.60, the compound προσρήσσω in Josephus (Ant. 6.9.3; 9.4.6), the gloss ῥῆξαι· καταβαλεῖν in Hesychius, the Vulgate elidit/allisit and the Peshitta, and above all Mark 9:20, where the boy falls to the ground after the spirit's action while the foaming, teeth-grinding and rigidity are described by separate verbs. Stein (BECNT Mark), with Bock (BECNT Luke) and Marshall (NIGTC Luke) combining both nuances, prefer "throws into convulsions", reading ἔρρηξεν καὶ συνεσπάραξεν as a fixed medico-demonological pair; the older "teareth him" of the KJV, defended for Mark by A. B. Bruce (Expositor's Greek Testament), is now judged inadequate by essentially all modern critical commentators. At Galatians 4:27 Paul quotes LXX Isaiah 54:1 verbatim in its Vaticanus form; the Isaiah translator had rendered פצח plus רנה with the Greek idiom ῥήγνυμι plus εὐφροσύνην, a translational innovation with no classical or wider Septuagintal parallel (Troxel, LXX-Isaiah as Translation and Interpretation), and Paul transposes the referent from exilic Zion to ἡ ἄνω Ἰερουσαλήμ (Betz, Hermeneia 246-247; Martyn, AYB 33A, 441-443; de Boer, NTL, 297-306; Jobes, WTJ 55 [1993] 299-320). In the Septuagint the simplex renders chiefly בקע and, in Isaiah alone, פצח, while קרע is carried almost invariably by the compound διαρρήγνυμι (Muraoka, GELS 2009).