means A dramatic, often violent upset or sudden change that overturns an existing order, whether geological, political, or personal.

from Built from "up" plus "heave" — the verb for lifting or hoisting with effort — capped with the noun-forming "-al." It began literally, describing land being heaved upward by geological force, before the meaning spread to any sudden, disruptive overturning. "Heave" itself traces back to Old English "hebban," to lift, a cousin of words across the Germanic family for raising and hoisting.