anastrophe
/ˌænæˈstrɒfi/Definitions
1. noun
a state of affairs that is the opposite of what was expected or intended; an unfortunate event or situation
“The company experienced an anastrophe when their new product failed to meet customer expectations.”
2. noun
a turn of affairs that is the opposite of what was expected or intended
“The politician’s anastrophe came when she was forced to resign due to a scandal.”