knell

To ring a bell slowly, especially for a death or funeral.

"The church bells knelled mournfully for the fallen."

An event or sound that signals the end or destruction of something significant.

"The new policy sounded the knell for traditional industries."

To signal the end or destruction of something.

"The defeat knelled the end of their hopes."

The solemn sound of a bell, especially when rung for a death or funeral.

"The mournful knell echoed across the valley."