to sound the death knell
[sound|toll|ring] the death-knell

Definition & Meaning of "sound the death knell"in English

to sound the death knell
01

***to cause or signal the impending end or ruin of something, especially a business, organization, or activity. Refers to the sound of a bell ringing (the knell) from a church to indicate that someone has die.

example
Examples
Many people thought that the Internet would toll the death knell for newspapers.
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