If plans to produce cellulosic ethanol are carried very far, it could be the death knell for biodiversity and, with it, humanity's life-support systems.
The collaboration of director and designer fell apart, but the death knell for the door was clearly at hand.
Online delivery is not the death knell for record companies.
But the synchro-cyclotron is not a symptom of the thriving state of nuclear physics, more like its death knell.
Assimilation may not be the death knell of a minority language, but language choice generally means "going with the flow," and the flow is toward the majority language.
We are talking about the death knell for the ferries.
By the same token, it would be the death knell for renewables.
It was the death knell for the minimum pension scheme.
