Strong's 4486 (ῥήγνυμι)

break (forth), burst, rend, tear

G2608 (κατάγνυμι) being its intensive (with the preposition in composition), and G2352 (θραύω) a shattering to minute fragments; but not a reduction to the constituent particles, like G3089 (λύω)) or disrupt, lacerate; by implication, to convulse (with spasms); figuratively, to give vent to joyful emotions

both prolonged forms of (which appears only in certain forms, and is itself probably a strengthened form of (see in G2608 (κατάγνυμι))) to "break," "wreck" or "crack", i.e. (especially) to sunder (by separation of the parts;