noun
funeral bell; death knell
A bell rung at a funeral or to announce a death; also used figuratively for something that signals the end or failure of something.
教会の弔鐘が静かに鳴り響いた。
The funeral bell of the church tolled quietly.
そのスキャンダルは政権の弔鐘となった。
The scandal became the death knell for the administration.