ぼつらく没落botsuraku
1.
The process by which something that was once prosperous, such as a nation or noble class, fades into decline and loses its former glory or status.
2.
The event where a stronghold or territory succumbs to defeat, resulting in its loss of power or control.
3.
A derogatory term used to insult someone, implying their descent into a pitiful state or disgrace.
Example:
商売でそんな失敗をしたらどんな会社でも没落する。