death knell
idiomPart ofdeath
death knell — idiom
1. an event or sign that marks the end or failure of something
1.idiom
Definition
an event or sign that marks the end or failure of something
Example
The invention of the smartphone sounded the death knell for the simple flip phone that could only make calls and send texts.
The leak of the company's financial problems rang the death knell for any hope of getting a bank loan.