1. Bouleversement.
2. Catastrophe.
ETYM Latin cataclysmos, Greek kataklysmos, from to dash over, inundate; kata downward, against + klyzein to wash: cf. French cataclysme.
1. An extensive overflow or sweeping flood of water; a deluge.
2. Any violent catastrophe, involving sudden and extensive changes of the earth's surface.
3. Catastrophe; upheaval.