What is the definition for knell?

A knell is the sound of a bell, especially when rung solemnly for a death or funeral. It can also be used metaphorically to refer to a sign or indication of an impending end, death, or failure.

Here are some examples of how "knell" is used:

* Literal meaning: "The mournful knell of the church bell echoed through the valley."

* Metaphorical meaning: "The news of the company's bankruptcy sounded the knell of their hopes for a bright future."

The word "knell" evokes a sense of solemnity, finality, and often sadness.