Definition of downfall noun from the Oxford Advanced Learner's Dictionary

 

downfall

 noun
noun
BrE BrE//ˈdaʊnfɔːl//
 
; NAmE NAmE//ˈdaʊnfɔːl//
 
[singular]
 
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the loss of a person’s money, power, social position, etc.; the thing that causes this The sex scandal finally led to his downfall. Greed was her downfall.Extra examples The failure of this plan contributed to her eventual downfall. The movement’s downfall came with the failed coup d’état. They were found guilty of plotting the downfall of the government. a scandal that brought about his downfall Sarah’s downfall came through being over-confident. The murder proved to be the downfall of the notorious brothers. The rift brought about the downfall of the coalition government.
See the Oxford Advanced American Dictionary entry: downfall