Dictionary / Vocabulary / 晩節を汚す
ばんせつをけがす
to ruin one's reputation in later life; to tarnish one's twilight years
Also written 晩節を穢す、晩節をけがす
文壇の大家ともあろう人が、まさか金銭トラブルを起こして晩節を汚すことになろうとは思いもよらなかった。
It was unheard of for a literary master, of all people, to get in financial trouble and fall in ruins.