Определение kiss of death в Английский Язык Английский Язык словарь
A kiss on the cheek that signifies the death of the receiver, as delivered by a mob boss or one with such influence
Something that may seem good and favourable but that actually brings ruin to hopes, plans, etc
The role in the soap opera was the kiss of death for Ann's career as a theatrical actress.
If you say that a particular event is the kiss of death for something, you mean that it is certain to make them fail or be a disaster. Trying to please an audience is the kiss of death for an artist. Something that is ultimately ruinous, destructive, or fatal: "Divorce was once a political kiss of death" (Ellen Goodman)
something that is ruinous; "if this were known it would be the kiss of death for my political career