cataclysm

英 ['kætə,klɪz(ə)m] 美['kætəklɪzəm]

• n. 灾难；大洪水，地震；（社会政治的）大变动

1. a sudden violent change in the earth's surface

2. an event resulting in great loss and misfortune;

"the whole city was affected by the irremediable calamity"

"the earthquake was a disaster"