downfall
/ˈdaʊnfɔːl/noun
1- a loss of power, prosperity, or status垮台; 衰落：
the crisis led to the downfall of the government.
那场危机导致了政府的垮台。
1.1
- the cause of such a loss垮台（或衰落）的原因：
his intractability will prove to be his downfall.
他的倔强脾气将使他最终败落。