downfall

1 ENTRIES FOUND:
downfall /ˈdaʊnˌfɑːl/ noun
plural downfalls
downfall
/ˈdaʊnˌfɑːl/
noun
plural downfalls
Britannica Dictionary definition of DOWNFALL
[count]
1 
: a sudden loss of power, happiness, success, etc.
2 
: something that causes failure