
The kiss of death
Negative Outcome
Use when actions lead directly to failure, not just a small setback.

Missing that deadline was the kiss of death for their project.
Final Blow
Emphasizes the last in a series of events that causes complete failure.

The negative review was the kiss of death to the restaurant's reputation.
Metaphoric Use
Not a physical kiss, but symbolic of a destructive action or event.

His endorsement turned out to be the kiss of death in the election.
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