The endorsement from the unpopular celebrity was the kiss of death for the politician's campaign.
Поддержка непопулярного знаменитости стала поцелуем смерти для избирательной кампании политика.
Definitions
An action or event that causes certain failure or ruin, often unintentionally; originally referring to a fatal gesture, it now commonly means something that guarantees the end or destruction of something.